List of Articles Mixed Integer programming Open Access Article Abstract Page Full-Text 1 - The project portfolio selection and scheduling problem: mathematical model and algorithms Bahman Naderi 20.1001.1.22519904.2013.6.13.7.6 Open Access Article Abstract Page Full-Text 2 - Centralized Supply Chain Network Ddesign: Monopoly, Duopoly, and Ooligopoly Competitions under Uncertainty kaveh Fahimi Seyed Mohammad Seyed Hosseini Ahmad Makui 10.22094/joie.2017.685.1439 20.1001.1.22519904.2018.11.2.5.7 Open Access Article Abstract Page Full-Text 3 - A Mixed Integer Programming Formulation for the Heterogeneous Fixed Fleet Open Vehicle Routing Problem Majid Yousefikhoshbakht Frazad Didehvar Farhad Rahmati 20.1001.1.22519904.2015.8.18.4.7