@article{
  author = {Hatami, Asieh sadat, Shafiee, Morteza, Rabbani, Mozhdeh, Mozaffari, Mohammad Reza},
  title = {Evaluating the Efficiency of Two-stage Networks using Ratio Analysis},
  journal = {International Journal of Data Envelopment Analysis},
  year = {2021},
  volume = {9},
  number = {1},
  pages = {1-12},
  doi = {}
}