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A general methodology for bootstrapping in non-parametric frontier models
Simar, Leopold, (2000)
Introducing Environmental Variables in Nonparametric Frontier Models: a Probabilistic Approach
Daraio, Cinzia, (2003)
Conditional Nonparametric Frontier Models for Convex and Non Convex Technologies: a Unifying Approach
Daraio, Cinzia, (2005)