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![Cover for H. David Sherman · Service Productivity Management: Improving Service Performance using Data Envelopment Analysis (DEA) (Paperback Book) [2006 edition] (2014)](https://imusic.b-cdn.net/images/item/original/056/9781461498056.jpg?h-david-sherman-2014-service-productivity-management-improving-service-performance-using-data-envelopment-analysis-dea-paperback-book&class=scaled&v=1527758085)