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![Cover for H Christiansen · Flexible Query Answering Systems: 6th International Conference, FQAS 2004, Lyon, France, June 24-26, 2004, Proceedings - Lecture Notes in Artificial Intelligence (Paperback Book) [2004 edition] (2004)](https://imusic.b-cdn.net/images/item/original/609/9783540221609.jpg?h-christiansen-2004-flexible-query-answering-systems-6th-international-conference-fqas-2004-lyon-france-june-24-26-2004-proceedings-lecture-notes-in-artificial-intelligence-paperback-book&class=scaled&v=1582940044)
![Cover for H Christiansen · Perspectives on Mathematics Education: Papers Submitted by Members of the Bacomet Group - Mathematics Education Library (Paperback Book) [Softcover reprint of the original 1st ed. 1986 edition] (1985)](https://imusic.b-cdn.net/images/item/original/181/9789027721181.jpg?h-christiansen-1985-perspectives-on-mathematics-education-papers-submitted-by-members-of-the-bacomet-group-mathematics-education-library-paperback-book&class=scaled&v=1609400717)