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Ray, C.S. (2004) Data Envelopment Analysis Theory and Techniques for Economics and Operations Research. Cambridge University Press, New York.
http://content.schweitzer-online.de/static/catalog_manager/live/media_files/
representation/zd_std_orig__zd_schw_orig/002/204/843/9780521802567_content_pdf_1.pdf
https://doi.org/10.1017/CBO9780511606731

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