List of Articles Pareto-Efficient Open Access Article Abstract Page Full-Text 1 - finding the defining hyperplanes of production possibility set with variable returns to scale using the linear independent vectors N. Rafati-‎Maleki M. Rostamy-Malkhalifeh Open Access Article Abstract Page Full-Text 2 - Directional Closest-Target Based Measures of Efficiency: Holder Norms Approach zahra kiani