List of Articles Open Vehicle Routing Problem Open Access Article Abstract Page Full-Text 1 - Optimizing of Open Vehicle Routing Problem by Using an Efficient Hybrid Meta-heuristic Algorithm Majid Yousefi khoshbakht Hassan Zarie Zahra Sadati Eskandari Narges Mahmmudi Daranie Ahmad Mahmmud Janlo 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