List of Articles Vibration damping optimizatio Open Access Article Abstract Page Full-Text 1 - A Multi-supplier Inventory Model with Permissible Delay in Payment and Discount M. Farhangi E. Mehdizadeh Open Access Article Abstract Page Full-Text 2 - Developing and Solving two Level Lot Sizing Problem with Multi Production Methods using Vibration Damping Optimization Algorithm Mohammad Ebrahimi Maghsod Amiri Open Access Article Abstract Page Full-Text 3 - A New Hybrid Algorithm to Optimize Stochastic-fuzzy Capacitated Multi-Facility Location-allocation Problem Esmaeil Mehdizadeh Mohammad Reza Tavarroth Vahid Hajipour