فهرس المقالات Convexity Principle. حرية الوصول المقاله صفحة الملخص نص كامل 1 - On the Violation of Convexity and Returns to Scale Assumptions in Fixed Cost Allocation (FCA) within the DEA Framework Mohammad Erahim Amin Ghafoori Farzad Rezai balf Reza Shahverdi