List of Articles Directional distance function Open Access Article Abstract Page Full-Text 1 - Directional Closest-Target Based Measures of Efficiency: Holder Norms Approach zahra kiani Open Access Article Abstract Page Full-Text 2 - Complete Closest-Target Based Directional FDH Measures of Efficiency in DEA Mahmood Mehdiloozad Israfil Roshdi Open Access Article Abstract Page Full-Text 3 - An inverse DEA approach in the presence of undesirable outputs based on the directional distance function Javad Gerami