TY  - JOUR
AU  - shoga, mehdi
AU  - hoseinzadeh lotfi, farhad
AU  - غلام ابری, امیر
AU  - Rashidi Komijan, Alireza
TI  - Efficiency of 4 stage supply chain in presence of non discretionary ,  undesirable and negative factors Using SBM model in DEA
JO  - Economic  Modeling
VL  - 14
IS  - 51
SP  - 73
EP  - 98
PY  - 2020
DO  - 10.30495/eco.2020.1899015.2357
ER  -