Jan 13 2017 Pedro Macedo and Elvira Silva   Sensitivity of directional technical inefficiency measures to the choice of the direction vector: a simulation study   Abstract  Contact Information  Citation  Full Text  -  Note   Aug 21 2015 Esso-hanam Atake   Technical efficiency of public hospitals in Togo: A directional distance function approach   Abstract  Contact Information  Citation  Full Text  -  Preliminary Result