@article{Ferrara2017,
author = {Ferrara, G. and Vidoli, F.},
title= {Semiparametric stochastic frontier models: A generalized additive model approach},
year = {2017},
doi = {10.1016/j.ejor.2016.09.008},
volume = {258},
number = {2},
pages = {761--777},
}