List of Articles lost sales Open Access Article Abstract Page Full-Text 1 - Airlines Scheduling under Consideration, Operational constraints Shokoh Kheradmand Mohamad Mohamadi Bahman Naderi Open Access Article Abstract Page Full-Text 2 - Estimation of the cost function of a two-echelon inventory system with lost sales using regression Mehdi Seif Barghy Maghsoud Amiri mostafa Heidari Open Access Article Abstract Page Full-Text 3 - New mathematical modeling for a location–routing–inventory problem in a multi-period closed-loop supply chain in a car industry F. Forouzanfar R. Tavakkoli-Moghaddam M. Bashiri A. Baboli S. M . Hadji Molana