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The necessary and sufficient conditions for returns to scale properties in generalized data envelopment analysis model[J] . Quanling Wei,Gang Yu,Jianshou Lu.  Science in China Series E: Technological Science . 2002 (5)
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Chapter 2 A generalized data envelopment analysis model: A unification and extension of existing methods for efficiency analysis of decision making units[J] . Gang Yu,Quanling Wei,Patrick Brockett.  Annals of Operations Research . 1996 (1)
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Comparing Teaching and Non-teaching Hospitals: A Frontier Approach (Teaching vs. Non-teaching Hospitals)[J] . Shawna Grosskopf,Dimitri Margaritis,Vivian Valdmanis.  Health Care Management Science . 2001 (2)