List of Articles Open Access Article Abstract Page Full-Text 1 - Proposing a mathematical programming model for load balancing in mobile cellular networks Shahram Saeidi Sahar Khoshfetrat Open Access Article Abstract Page Full-Text 2 - A Decision-Making Model for Supplier Selection Based on Data Envelopment Analysis Hoda Moradi Mehdi abbaszadeh Open Access Article Abstract Page Full-Text 3 - Optimum placement of Distributed Generation Sources to Minimize Losses and to Improvement Voltage Profile of Distribute Network Using Data Envelopment Analysis Method Hossein Tohidi Open Access Article Abstract Page Full-Text 4 - Estimation of inputs and outputs in the general production possibility set with negative data based on the inverse DEA Javad Gerami Open Access Article Abstract Page Full-Text 5 - The Relationship Between Sleep Quality and Headache Intensity in Migraine Patients Referred to Affiliated Centers of Babol University of Medical Sciences Centers in 2020 Fatemehossadat Mirmohammadiberenjestanaki Open Access Article Abstract Page Full-Text 6 - A New Three-Stage Robust Data Envelopment Analysis Model with application in the dairy industry farhad sanchooli Seyed Esmail Najafi farzad Movahedi Sobhani