List of Articles Open Access Article Abstract Page Full-Text 1 - Reliability optimization problems with multiple constraints under fuzziness Neha Gupta Sanam Haseen Abdul Bari Open Access Article Abstract Page Full-Text 2 - A multi-objective genetic algorithm for a mixed-model assembly U-line balancing type-I problem considering human-related issues, training, and learning Masoud Rabbani Mona Montazeri Hamed Farrokhi-Asl Hamed Rafiei Open Access Article Abstract Page Full-Text 3 - Optimization of two-stage production/inventory systems under order base stock policy with advance demand information Koichi Nakade Shiori Yokozawa Open Access Article Abstract Page Full-Text 4 - Optimizing the preventive maintenance scheduling by genetic algorithm based on cost and reliability in National Iranian Drilling Company Habibollah Javanmard Abd al-Wahhab Koraeizadeh Open Access Article Abstract Page Full-Text 5 - Nash equilibrium strategy in the deregulated power industry and comparing its lost welfare with Iran wholesale electricity market Seyed Hosein Mousavi Ali Nazemi Ashkan Hafezalkotob Open Access Article Abstract Page Full-Text 6 - Erratum to: Armentum: a hybrid direct search optimization methodology Francisco Zorrilla Briones Jaime Sa´nchez Leal Inocente Yuliana Mele´ndez Pastrana Open Access Article Abstract Page Full-Text 7 - Finding stability regions for preserving efficiency classification of variable returns to scale technology in data envelopment analysis P . Zamani M . Borzouei Open Access Article Abstract Page Full-Text 8 - A green vehicle routing problem with customer satisfaction criteria M. Afshar-Bakeshloo A. Mehrabi H . Safari M. Maleki F. Jolai Open Access Article Abstract Page Full-Text 9 - Solving a bi-objective mathematical model for location-routing problem with time windows in multi-echelon reverse logistics using metaheuristic procedure V. R. Ghezavati M. Beigi Open Access Article Abstract Page Full-Text 10 - Armentum: a hybrid direct search optimization methodology Francisco Zorrilla Briones Jaime Sa´nchez Leal Inocente Yuliana Mele´ndez Pastrana Open Access Article Abstract Page Full-Text 11 - A firefly algorithm for solving competitive location-design problem: a case study Seyed Jafar Sadjadi Milad Gorji Ashtiani Reza Ramezanian Ahmad Makui