Izdevēji Springer Nature Switzerland AG

Cover for Boris M. Makarov · Smooth Functions and Maps - Moscow Lectures (Hardcover Book) [2021 edition] (2021)

Smooth Functions and Maps - Mosc... (2021)

Boris M. Makarov

Cover for Boris M. Makarov · Smooth Functions and Maps - Moscow Lectures (Paperback Book) [2021 edition] (2022)

Smooth Functions and Maps - Mosc... (2022)

Boris M. Makarov

Cover for Nonhuman Agencies in the Twenty-First-Century Anglophone Novel (Hardcover Book) [2021 edition] (2021)

Nonhuman Agencies in the Twenty-... (2021)

Cover for Nonhuman Agencies in the Twenty-First-Century Anglophone Novel (Paperback Book) [2021 edition] (2022)

Nonhuman Agencies in the Twenty-... (2022)

Cover for Goran Petrovic-Lotina · Choreographing Agonism: Politics, Strategies and Performances of the Left (Hardcover Book) [2021 edition] (2021)

Choreographing Agonism: Politics... (2021)

Goran Petrovic-Lotina

Cover for Goran Petrovic-Lotina · Choreographing Agonism: Politics, Strategies and Performances of the Left (Paperback Book) [2021 edition] (2022)

Choreographing Agonism: Politics... (2022)

Goran Petrovic-Lotina

Cover for Climate Emergency – Managing, Building , and Delivering the Sustainable Development Goals: Selected Proceedings from the International Conference of Sustainable Ecological Engineering Design for Society (SEEDS) 2020 (Hardcover Book) [2022 edition] (2021)

Climate Emergency – Managing, Bu... (2021)

Cover for Climate Emergency – Managing, Building , and Delivering the Sustainable Development Goals: Selected Proceedings from the International Conference of Sustainable Ecological Engineering Design for Society (SEEDS) 2020 (Paperback Book) [2022 edition] (2022)

Climate Emergency – Managing, Bu... (2022)

Cover for The Role of e-Business during the Time of Grand Challenges: 19th Workshop on e-Business, WeB 2020, Virtual Event, December 12, 2020, Revised Selected Papers - Lecture Notes in Business Information Processing (Paperback Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

The Role of e-Business during th... (2021)

Cover for Advances and Trends in Artificial Intelligence. Artificial Intelligence Practices: 34th International Conference on Industrial, Engineering and Other Applications of Applied Intelligent Systems, IEA / AIE 2021, Kuala Lumpur, Malaysia, July 26–29, 2021, Pr (Paperback Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Advances and Trends in Artificia... (2021)

Cover for Persuasive Technology: 16th International Conference, PERSUASIVE 2021, Virtual Event, April 12–14, 2021, Proceedings - Lecture Notes in Computer Science (Paperback Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Persuasive Technology: 16th Inte... (2021)

Cover for Advances and Trends in Artificial Intelligence. From Theory to Practice: 34th International Conference on Industrial, Engineering and Other Applications of Applied Intelligent Systems, IEA / AIE 2021, Kuala Lumpur, Malaysia, July 26–29, 2021, Proceedings, (Paperback Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Advances and Trends in Artificia... (2021)

Cover for Dan Geva · A Philosophical History of Documentary, 1895–1959 (Hardcover Book) [2021 edition] (2021)

A Philosophical History of Docum... (2021)

Cover for Dan Geva · A Philosophical History of Documentary, 1895–1959 (Paperback Book) [2021 edition] (2022)

A Philosophical History of Docum... (2022)

Cover for Refugee Education across the Lifespan: Mapping Experiences of Language Learning and Use - Educational Linguistics (Hardcover Book) [2021 edition] (2021)

Refugee Education across the Lif... (2021)

Cover for Refugee Education across the Lifespan: Mapping Experiences of Language Learning and Use - Educational Linguistics (Paperback Book) [2021 edition] (2022)

Refugee Education across the Lif... (2022)

Cover for Computer and Information Science 2021—Summer - Studies in Computational Intelligence (Hardcover Book) [2021 edition] (2021)

Computer and Information Science... (2021)

Cover for Computer and Information Science 2021—Summer - Studies in Computational Intelligence (Paperback Book) [2021 edition] (2022)

Computer and Information Science... (2022)

Cover for Network and Parallel Computing: 17th IFIP WG 10.3 International Conference, NPC 2020, Zhengzhou, China, September 28–30, 2020, Revised Selected Papers - Lecture Notes in Computer Science (Paperback Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Network and Parallel Computing: ... (2021)

Cover for The Failed Rotator Cuff: Diagnosis and Management (Hardcover Book) [2021 edition] (2021)

The Failed Rotator Cuff: Diagnos... (2021)

Cover for Augustus D. Mazzocca-Felix H. Savoie Iii-Emilio Ca · The Failed Rotator Cuff: Diagnosis and Management (Paperback Book) [2021 edition] (2022)

The Failed Rotator Cuff: Diagnos... (2022)

Augustus D. Mazzocca-Felix H. Sa...

Cover for Early Osteoarthritis: State-of-the-Art Approaches to Diagnosis, Treatment and Controversies (Hardcover Book) [2022 edition] (2021)

Early Osteoarthritis: State-of-t... (2021)

Cover for Early Osteoarthritis: State-of-the-Art Approaches to Diagnosis, Treatment and Controversies (Paperback Book) [2022 edition] (2022)

Early Osteoarthritis: State-of-t... (2022)

Cover for Paul Hoyer · Journey to the Bound States - SpringerBriefs in Physics (Paperback Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Journey to the Bound States - Sp... (2021)

Cover for Victor Erokhin · Fundamentals of Organic Neuromorphic Systems (Hardcover Book) [2021 edition] (2021)

Fundamentals of Organic Neuromor... (2021)

Cover for Victor Erokhin · Fundamentals of Organic Neuromorphic Systems (Paperback Book) [2022 edition] (2022)

Fundamentals of Organic Neuromor... (2022)

Cover for Industry 4.0: Fighting Climate Change in the Economy of the Future (Hardcover Book) [2021 edition] (2022)

Industry 4.0: Fighting Climate C... (2022)

Cover for Industry 4.0: Fighting Climate Change in the Economy of the Future (Paperback Book) [2022 edition] (2023)

Industry 4.0: Fighting Climate C... (2023)

Cover for Patricia Marsh · The Spanish Flu in Ireland: A Socio-Economic Shock to Ireland, 1918–1919 - Palgrave Studies in Economic History (Hardcover Book) [2021 edition] (2021)

The Spanish Flu in Ireland: A So... (2021)

Cover for Patricia Marsh · The Spanish Flu in Ireland: A Socio-Economic Shock to Ireland, 1918–1919 - Palgrave Studies in Economic History (Paperback Book) [2021 edition] (2022)

The Spanish Flu in Ireland: A So... (2022)

Cover for Maria Jose Plana Casado · E-FOOD: Closing the Online Enforcement Gap in the EU Platform Economy - Studies in European Economic Law and Regulation (Hardcover Book) [2021 edition] (2021)

E-FOOD: Closing the Online Enfor... (2021)

Maria Jose Plana Casado

Cover for Maria Jose Plana Casado · E-FOOD: Closing the Online Enforcement Gap in the EU Platform Economy - Studies in European Economic Law and Regulation (Paperback Book) [2021 edition] (2022)

E-FOOD: Closing the Online Enfor... (2022)

Maria Jose Plana Casado

Cover for Christian Blick · Inverse Magnetometry: Mollifier Magnetization Distribution from Geomagnetic Field Data - Lecture Notes in Geosystems Mathematics and Computing (Paperback Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Inverse Magnetometry: Mollifier ... (2021)

Christian Blick

Cover for The Carbonic Anhydrases: Current and Emerging Therapeutic Targets - Progress in Drug Research (Hardcover Book) [2021 edition] (2021)

The Carbonic Anhydrases: Current... (2021)

Cover for The Carbonic Anhydrases: Current and Emerging Therapeutic Targets - Progress in Drug Research (Paperback Book) [2021 edition] (2022)

The Carbonic Anhydrases: Current... (2022)

Cover for Bengt Lindstroem-Shifra Sagy-Monica Eriksson-Mauri · The Handbook of Salutogenesis (Hardcover Book) [2nd ed. 2022 edition] (2021)

2nd ed. 2022 edition

The Handbook of Salutogenesis (2021)

Bengt Lindstroem-Shifra Sagy-Mon...

Cover for The Handbook of Salutogenesis (Paperback Book) [2nd ed. 2022 edition] (2021)

2nd ed. 2022 edition

The Handbook of Salutogenesis (2021)

Cover for Smart Monitoring of Rotating Machinery for Industry 4.0 - Applied Condition Monitoring (Hardcover Book) [2022 edition] (2021)

Smart Monitoring of Rotating Mac... (2021)

Cover for Smart Monitoring of Rotating Machinery for Industry 4.0 - Applied Condition Monitoring (Paperback Book) [2022 edition] (2022)

Smart Monitoring of Rotating Mac... (2022)

Cover for Use and Reuse of the Digital Archive (Hardcover Book) [2021 edition] (2021)

Use and Reuse of the Digital Arc... (2021)

Cover for Use and Reuse of the Digital Archive (Paperback Book) [2021 edition] (2022)

Use and Reuse of the Digital Arc... (2022)

Cover for Structural Information and Communication Complexity: 28th International Colloquium, SIROCCO 2021, Wroclaw, Poland, June 28 – July 1, 2021, Proceedings - Lecture Notes in Computer Science (Paperback Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Structural Information and Commu... (2021)

Cover for Keats's Reading / Reading Keats: Essays in Memory of Jack Stillinger (Hardcover Book) [1st ed. 2022 edition] (2022)

1st ed. 2022 edition

Keats's Reading / Reading Keats:... (2022)

Cover for Keats’s Reading / Reading Keats: Essays in Memory of Jack Stillinger (Paperback Book) [2022 edition] (2023)

Keats’s Reading / Reading Keats:... (2023)

Cover for Roderick Macdonald · Open and Closed Economies: Lessons from the Philippines and Vietnam (Hardcover Book) [1st ed. 2022 edition] (2021)

1st ed. 2022 edition

Open and Closed Economies: Lesso... (2021)

Roderick Macdonald

Cover for Liberalism and Socialism: Mortal Enemies or Embittered Kin? - Palgrave Studies in Classical Liberalism (Hardcover Book) [2021 edition] (2021)

Liberalism and Socialism: Mortal... (2021)

Cover for Liberalism and Socialism: Mortal Enemies or Embittered Kin? - Palgrave Studies in Classical Liberalism (Paperback Book) [2021 edition] (2022)

Liberalism and Socialism: Mortal... (2022)

Cover for Sara Torregrosa Hetland · The Spanish Fiscal Transition: Tax Reform and Inequality in the Late Twentieth Century - Palgrave Studies in Economic History (Hardcover Book) [2021 edition] (2021)

The Spanish Fiscal Transition: T... (2021)

Sara Torregrosa Hetland

Cover for Sara Torregrosa Hetland · The Spanish Fiscal Transition: Tax Reform and Inequality in the Late Twentieth Century - Palgrave Studies in Economic History (Paperback Book) [2021 edition] (2022)

The Spanish Fiscal Transition: T... (2022)

Sara Torregrosa Hetland

Cover for Andreas Wittmer · Aviation Systems: Management of the Integrated Aviation Value Chain - Classroom Companion: Business (Hardcover Book) [Second Edition 2021 edition] (2021)

Second Edition 2021 edition

Aviation Systems: Management of ... (2021)

Andreas Wittmer

Cover for Aviation Systems: Management of the Integrated Aviation Value Chain - Classroom Companion: Business (Paperback Book) [Second Edition 2021 edition] (2022)

Second Edition 2021 edition

Aviation Systems: Management of ... (2022)

Cover for Metaheuristics for Finding Multiple Solutions - Natural Computing Series (Hardcover Book) [2021 edition] (2021)

Metaheuristics for Finding Multi... (2021)

Cover for Metaheuristics for Finding Multiple Solutions - Natural Computing Series (Paperback Book) [2021 edition] (2022)

Metaheuristics for Finding Multi... (2022)

Cover for Robert Abele · The Self-Conscious, Thinking Subject: A Kantian Contribution to Reestablishing Reason in a Post-Truth Age (Hardcover Book) [2021 edition] (2021)

The Self-Conscious, Thinking Sub... (2021)

Cover for Robert Abele · The Self-Conscious, Thinking Subject: A Kantian Contribution to Reestablishing Reason in a Post-Truth Age (Paperback Book) [2021 edition] (2022)

The Self-Conscious, Thinking Sub... (2022)

Cover for New Results in Numerical and Experimental Fluid Mechanics XIII: Contributions to the 22nd STAB / DGLR Symposium - Notes on Numerical Fluid Mechanics and Multidisciplinary Design (Hardcover Book) [2021 edition] (2021)

New Results in Numerical and Exp... (2021)

Cover for New Results in Numerical and Experimental Fluid Mechanics XIII: Contributions to the 22nd STAB / DGLR Symposium - Notes on Numerical Fluid Mechanics and Multidisciplinary Design (Paperback Book) [2021 edition] (2022)

New Results in Numerical and Exp... (2022)

Cover for Adolfo Figueroa · The Quality of Society, Volume II: Essays on the Unified Theory of Capitalism (Hardcover Book) [2021 edition] (2021)

The Quality of Society, Volume I... (2021)

Adolfo Figueroa

Cover for Adolfo Figueroa · The Quality of Society, Volume II: Essays on the Unified Theory of Capitalism (Paperback Book) [2021 edition] (2022)

The Quality of Society, Volume I... (2022)

Adolfo Figueroa

Cover for Constantino Tsallis · Introduction to Nonextensive Statistical Mechanics: Approaching a Complex World (Hardcover Book) [Second Edition 2023 edition] (2023)

Second Edition 2023 edition

Introduction to Nonextensive Sta... (2023)

Constantino Tsallis

Cover for Constantino Tsallis · Introduction to Nonextensive Statistical Mechanics: Approaching a Complex World (Paperback Book) [Second Edition 2023 edition] (2024)

Second Edition 2023 edition

Introduction to Nonextensive Sta... (2024)

Constantino Tsallis

Cover for Sana Rizvi · Undoing Whiteness in Disability Studies: The Special Education System and British South Asian Mothers (Hardcover Book) [2021 edition] (2021)

Undoing Whiteness in Disability ... (2021)

Cover for Sana Rizvi · Undoing Whiteness in Disability Studies: The Special Education System and British South Asian Mothers (Paperback Book) [2021 edition] (2022)

Undoing Whiteness in Disability ... (2022)

Cover for Bora Altay · Rules, Contracts and Law Enforcement in the Ottoman Empire: The Case of Tax-Farming Contracts - Palgrave Studies in Institutions, Economics and Law (Hardcover Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Rules, Contracts and Law Enforce... (2021)

Cover for Love and Revolution in the Twentieth-Century Colonial and Postcolonial World: Perspectives from South Asia and Southern Africa - Palgrave Studies in the History of Social Movements (Hardcover Book) [2021 edition] (2021)

Love and Revolution in the Twent... (2021)

Cover for Love and Revolution in the Twentieth-Century Colonial and Postcolonial World: Perspectives from South Asia and Southern Africa - Palgrave Studies in the History of Social Movements (Paperback Book) [2021 edition] (2022)

Love and Revolution in the Twent... (2022)

Cover for Joseph S. P. Fong · Information Systems Reengineering, Integration and Normalization: Heterogeneous Database Connectivity (Paperback Book) [4th ed. 2021 edition] (2021)

4th ed. 2021 edition

Information Systems Reengineerin... (2021)

Joseph S. P. Fong

Cover for Santorio Santori and the Emergence of Quantified Medicine, 1614-1790: Corpuscularianism, Technology and Experimentation - Palgrave Studies in Medieval and Early Modern Medicine (Hardcover Book) [2021 edition] (2022)

Santorio Santori and the Emergen... (2022)

Cover for Santorio Santori and the Emergence of Quantified Medicine, 1614-1790: Corpuscularianism, Technology and Experimentation - Palgrave Studies in Medieval and Early Modern Medicine (Paperback Book) [2022 edition] (2023)

Santorio Santori and the Emergen... (2023)

Cover for Michael Fabinyi · Asia-Pacific Fishing Livelihoods (Hardcover Book) [1st ed. 2022 edition] (2021)

1st ed. 2022 edition

Asia-Pacific Fishing Livelihoods (2021)

Michael Fabinyi

Cover for Vindicatory Justice: Beyond Law and Revenge - Ius Gentium: Comparative Perspectives on Law and Justice (Hardcover Book) [2021 edition] (2021)

Vindicatory Justice: Beyond Law ... (2021)

Cover for Ignasi Terradas Saborit-Riccardo Mazzola-Raul Marq · Vindicatory Justice: Beyond Law and Revenge - Ius Gentium: Comparative Perspectives on Law and Justice (Paperback Book) [2022 edition] (2022)

Vindicatory Justice: Beyond Law ... (2022)

Ignasi Terradas Saborit-Riccardo...

Cover for Umut Gursoy · Holography and Magnetically Induced Phenomena in QCD - SpringerBriefs in Physics (Paperback Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Holography and Magnetically Indu... (2021)

Cover for Boris S. Kerner · Understanding Real Traffic: Paradigm Shift in Transportation Science (Hardcover Book) [2021 edition] (2021)

Understanding Real Traffic: Para... (2021)

Boris S. Kerner

Cover for Boris S. Kerner · Understanding Real Traffic: Paradigm Shift in Transportation Science (Paperback Book) [2021 edition] (2022)

Understanding Real Traffic: Para... (2022)

Boris S. Kerner

Cover for Towards Intelligent Systems Modeling and Simulation: With Applications to Energy, Epidemiology and Risk Assessment - Studies in Systems, Decision and Control (Hardcover Book) [2022 edition] (2021)

Towards Intelligent Systems Mode... (2021)

Cover for Towards Intelligent Systems Modeling and Simulation: With Applications to Energy, Epidemiology and Risk Assessment - Studies in Systems, Decision and Control (Paperback Book) [2022 edition] (2022)

Towards Intelligent Systems Mode... (2022)

Cover for Shifting Economic, Financial and Banking Paradigm: New Systems to Encounter COVID-19 - Studies in Systems, Decision and Control (Hardcover Book) [2022 edition] (2021)

Shifting Economic, Financial and... (2021)

Cover for Shifting Economic, Financial and Banking Paradigm: New Systems to Encounter COVID-19 - Studies in Systems, Decision and Control (Paperback Book) [2022 edition] (2022)

Shifting Economic, Financial and... (2022)

Cover for Engineering and Sciences Teaching and Learning Activities: New Systems Throughout COVID-19 Pandemics - Studies in Systems, Decision and Control (Hardcover Book) [2022 edition] (2021)

Engineering and Sciences Teachin... (2021)

Cover for Engineering and Sciences Teaching and Learning Activities: New Systems Throughout COVID-19 Pandemics - Studies in Systems, Decision and Control (Paperback Book) [2022 edition] (2022)

Engineering and Sciences Teachin... (2022)

Cover for Dario Sabella · Multi-access Edge Computing: Software Development at the Network Edge - Textbooks in Telecommunication Engineering (Hardcover Book) [2021 edition] (2021)

Multi-access Edge Computing: Sof... (2021)

Cover for Dario Sabella · Multi-access Edge Computing: Software Development at the Network Edge - Textbooks in Telecommunication Engineering (Paperback Book) [2021 edition] (2022)

Multi-access Edge Computing: Sof... (2022)

Cover for Reimagining Science Education in the Anthropocene - Palgrave Studies in Education and the Environment (Hardcover Book) [1st ed. 2022 edition] (2021)

1st ed. 2022 edition

Reimagining Science Education in... (2021)

Cover for Reimagining Science Education in the Anthropocene - Palgrave Studies in Education and the Environment (Paperback Book) [1st ed. 2022 edition] (2021)

1st ed. 2022 edition

Reimagining Science Education in... (2021)

Cover for Glenn Fosbraey · Reading Eminem: A Critical, Lyrical Analysis (Hardcover Book) [2022 edition] (2022)

Reading Eminem: A Critical, Lyri... (2022)

Cover for Glenn Fosbraey · Reading Eminem: A Critical, Lyrical Analysis (Paperback Book) [2022 edition] (2023)

Reading Eminem: A Critical, Lyri... (2023)

Cover for Carlos A. Cifuentes · Interfacing Humans and Robots for Gait Assistance and Rehabilitation (Hardcover Book) [2021 edition] (2021)

Interfacing Humans and Robots fo... (2021)

Carlos A. Cifuentes

Cover for Carlos A. Cifuentes · Interfacing Humans and Robots for Gait Assistance and Rehabilitation (Paperback Book) [2022 edition] (2022)

Interfacing Humans and Robots fo... (2022)

Carlos A. Cifuentes

Cover for Drainage Basin Dynamics: An Introduction to Morphology, Landscape and Modelling - Geography of the Physical Environment (Hardcover Book) [2022 edition] (2022)

Drainage Basin Dynamics: An Intr... (2022)

Cover for Drainage Basin Dynamics: An Introduction to Morphology, Landscape and Modelling - Geography of the Physical Environment (Paperback Book) [2022 edition] (2023)

Drainage Basin Dynamics: An Intr... (2023)

Cover for Finding Solutions of the 21st Century Transportation Problems Through Research and Innovations: Proceedings of the 6th GeoChina International Conference on Civil & Transportation Infrastructures: From Engineering to Smart & Green Life Cycle Solutions -- N (Paperback Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Finding Solutions of the 21st Ce... (2021)

Cover for New Approaches of Geotechnical Engineering: Soil Characterization, Sustainable Materials and Numerical Simulation: Proceedings of the 6th GeoChina International Conference on Civil & Transportation Infrastructures: From Engineering to Smart & Green Life C (Paperback Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

New Approaches of Geotechnical E... (2021)

Cover for Infrastructure Sustainability Through New Developments in Material, Design, Construction, Maintenance, and Testing of Pavements: Proceedings of the 6th GeoChina International Conference on Civil & Transportation Infrastructures: From Engineering to Smart (Paperback Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Infrastructure Sustainability Th... (2021)

Cover for Developments in Sustainable Geomaterials and Environmental Geotechnics: Proceedings of the 6th GeoChina International Conference on Civil & Transportation Infrastructures: From Engineering to Smart & Green Life Cycle Solutions -- Nanchang, China, 2021 - S (Paperback Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Developments in Sustainable Geom... (2021)

Cover for Smart and Green Solutions for Civil Infrastructures Incorporating Geological and Geotechnical Aspects: Proceedings of the 6th GeoChina International Conference on Civil & Transportation Infrastructures: From Engineering to Smart & Green Life Cycle Solutio (Paperback Book) [1st ed. 2021 edition] (2021)

1st ed. 2021 edition

Smart and Green Solutions for Ci... (2021)

Cover for Camila Rocha · The Bolsonaro Paradox: The Public Sphere and Right-Wing Counterpublicity in Contemporary Brazil - Latin American Societies (Hardcover Book) [2021 edition] (2021)

The Bolsonaro Paradox: The Publi... (2021)

Cover for Camila Rocha · The Bolsonaro Paradox: The Public Sphere and Right-Wing Counterpublicity in Contemporary Brazil - Latin American Societies (Paperback Book) [2021 edition] (2022)

The Bolsonaro Paradox: The Publi... (2022)

Cover for Christopher Houston · Theocracy, Secularism, and Islam in Turkey: Anthropocratic Republic - Contemporary Anthropology of Religion (Hardcover Book) [2021 edition] (2021)

Theocracy, Secularism, and Islam... (2021)

Christopher Houston

Cover for Corporate Responsibility, Sustainability and Markets: How Ethical Organisations and Consumers Shape Markets - Palgrave Studies in Governance, Leadership and Responsibility (Hardcover Book) [2021 edition] (2021)

Corporate Responsibility, Sustai... (2021)