TY  - JOUR
AU  - Keivan, Ebrahim
AU  - Iranzadeh, Soleyman
TI  - Application of Data Envelopment Analysis in Measuring the Relative Efficiency of Local Telephone Exchanges:A Case Study of Telecommunication Region of East Azerbaijan
JO  - The Journal of Productivity Management
VL  - 17
IS  - 3
SP  - 49
EP  - 72
PY  - 2023
DO  - 10.30495/qjopm.2022.1901847.2879
ER  -