List of Articles Open Access Article Abstract Page Full-Text 1 - A novel study on nonlinear fractional differential equations: general solution Mousa Ilie Ali Khoshkenar Open Access Article Abstract Page Full-Text 2 - DEA models with out explicit inputs or outputs: radial and nonradial approaches Zohreh Moghaddas Open Access Article Abstract Page Full-Text 3 - Merger analysis using inverse DEA: the case of variable returns to scale Mojtaba Ghiasi Open Access Article Abstract Page Full-Text 4 - Efficiency Evaluation of Economic Enterprise in Presence of Interval Undesirable and Negative Data Mahnaz Maghbouli Mahdi Eini Farhad Taher Fatemeh Ghomanjani Open Access Article Abstract Page Full-Text 5 - Modeling and Optimization of Chemical Fertilizers Supply Chain using Hybrid Whale Optimization and Simulated Annealing Motahareh Rabbani Seyyed Mahammad Hadji Molana Seyed Mojtaba Sajadi Mohammad Hossein Davoodi Open Access Article Abstract Page Full-Text 6 - Multi-objective firefly optimization algorithm for construction site layout planning Abolfazl Ghadiri Davood Sedaghat Shayegan Ali Asghar Amirkardoust