List of Articles Heterogeneous Fleet Open Access Article Abstract Page Full-Text 1 - 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 2 - Joint Pricing and Inventory Routing Modeling in a Two Echelon Closed Supply Chain mohamad mohamadnejad Isa nakhaei kama abadi Ramin Sadeghian Fardin Ahmadi zar