None radial DEA model for estimating return to scale in regulated environment

Khodabakhshi M نويسنده Department of Mathematics, Faculty of Mathematical Sciences, Shahid Beheshti University, G.C., Tehran, Iran , Safdari Hadi نويسنده Antimicrobial Resistance Research Center, Mashhad University of Medical Sciences, Mashhad, IR Iran , Emami F نويسنده Dept. of Cardiology, School of Medicine, Hamadan University of Medical Sciences, Iran