List of Articles Ant colony system Open Access Article Abstract Page Full-Text 1 - A Comparative Study on Performance of "ant colony system" and "Linear Programming" methods in the Modeling of the Flow Shop Scheduling Said Esfandyari Ali Morovati Sharif Abadi Seyed Habibolah Mirghafouri Hamid Reza Kadkhodazadeh Open Access Article Abstract Page Full-Text 2 - A Mixed Integer Programming Formulation for the Heterogeneous Fixed Fleet Open Vehicle Routing Problem Majid Yousefikhoshbakht Frazad Didehvar Farhad Rahmati Open Access Article Abstract Page Full-Text 3 - Solving the vehicle routing problem by a hybrid meta-heuristic algorithm Majid Yousefikhoshbakht Esmaile Khorram Open Access Article Abstract Page Full-Text 4 - Prediction of melting points of a diverse chemical set using fuzzy regression tree Vali Zare-Shahabadi