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![Cover for Georg Westermann · Data Envelopment Analysis in the Service Sector - Harzer Wirtschaftswissenschaftliche Schriften (Paperback Book) [1999 edition] (1999)](https://imusic.b-cdn.net/images/item/original/129/9783824470129.jpg?georg-westermann-1999-data-envelopment-analysis-in-the-service-sector-harzer-wirtschaftswissenschaftliche-schriften-paperback-book&class=scaled&v=1615226852)