فهرس المقالات Sepideh Vatani المقاله 1 - Evaluating Efficiency by Multiplier Method in Two-Stage Unit with Undesirable Outputs 10.30495/ijdea.2022.68506.1168 Sepideh Vatani International Journal of Data Envelopment Analysis , العدد 1 , السنة 10 , زمستان 2022 المقاله 2 - Evaluation of efficiency using the product method in two-stage systems with undesirable outputs 10.30495/ijdea.2022.68507.1169 Sepideh Vatani International Journal of Data Envelopment Analysis , العدد 2 , السنة 9 , بهار 2021
