فهرس المقالات amirhossein yadollahi المقاله 1 - Centralized resource allocation with the possibility of downsizing to evaluate two-stage production system with shared inputs 20.1001.1.25885723.2021.13.2.1.6 Amir Yadollahi Reza Kazemi Matin Farhad Hosseinzadeh Lotfi Iranian Journal of Optimization , العدد 2 , السنة 13 , بهار 2021