@article{
  author = {Keivan, Ebrahim, Iranzadeh, Soleyman},
  title = {Application of Data Envelopment Analysis in Measuring the Relative Efficiency of Local Telephone Exchanges:A Case Study of Telecommunication Region of East Azerbaijan},
  journal = {The Journal of Productivity Management},
  year = {2023},
  volume = {17},
  issue = {3},
  pages = {49-72},
  doi = {10.30495/qjopm.2022.1901847.2879},
  url = {https://sanad.iau.ir/fa/Article/975821}
}