List of Articles Open Access Article Abstract Page Full-Text 1 - Optimizing the Airline Routing Cost using Linear Programming and PSO Algorithm Shahram Saeidi Sahar Khoshfetrat Open Access Article Abstract Page Full-Text 2 - An inverse DEA approach in the presence of undesirable outputs based on the directional distance function Javad Gerami Open Access Article Abstract Page Full-Text 3 - Surveying the Efficiency of Parliamentarians’ Suggestion about the Allocation of Credit to Eliminate Deprivation by Using the AHP Approach Saeed Papi Saeid Mehrabian Open Access Article Abstract Page Full-Text 4 - Ranking of the suitability of investment for online sales in different fields of clothing in Shiraz City using the Data Envelopment Analysis method Mehdi Abbasi Ali Doroodchi Open Access Article Abstract Page Full-Text 5 - Fixed cost allocation in two-stage system in the presence of undesirable outputs Leila Emami Farhad Hosseinzadeh Lotfi Mohsen Rostamy Open Access Article Abstract Page Full-Text 6 - Estimating and improving the efficiency of decision-making units with interval data Farshad Hosseinzadehlotfi Tofigh Allahviranloo Bijan Rahmaniperchkolaei