List of Articles Directional distance function Open Access Article Abstract Page Full-Text 1 - The directional hybrid measure of efficiency in data envelopment analysis A. Mirsalehy M. Rizam Abu Baker L. S. Lee Gh. R. Jahanshahloo 20.1001.1.22520201.2016.05.03.2.5 Open Access Article Abstract Page Full-Text 2 - Stochastic Non-Parametric Frontier Analysis M. Rahmani Gh. Jahanshahloo 20.1001.1.22520201.2013.02.01.4.2