Bougnol ML, JH Dula, D Retzlaff-Roberts and NK Womer (2005). “Nonparametric Frontier Analysis with Multiple Constituencies.” JORS 56(3): 252-266.
Bougnol ML, JH Dula, D Retzlaff-Roberts and NK Womer (2005). “Nonparametric Frontier Analysis with Multiple Constituencies.” JORS 56(3): 252-266.