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Conditional nonparametric frontier models for convex and non convex technologies: A unifying approach
Daraio, Cinzia, (2005)
Testing the "separability" condition in two-stage nonparametric models of production
Daraio, Cinzia, (2015)
Efficiency and economies of scale and scope in European universities. A directional distance approach
Bonaccorsi, Andrea, (2014)