Daraio C and L Simar (2005). “Introducing Environmental Variables in Nonparametric Frontier Models: A Probabilistic Approach.” JPA 24(1): 93-121.

Daraio C and L Simar (2005). “Introducing Environmental Variables in Nonparametric Frontier Models: A Probabilistic Approach.” JPA 24(1): 93-121.

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