@article{
  author = {Jahanshahloo, G. R., Fallahnejad, R.},
  title = {Obtaining a Unique Solution for the Cross Efficiency by Using the Lexicographic method},
  journal = {Iranian Journal of Optimization},
  year = {2010},
  volume = {6},
  number = {1},
  pages = {691-701},
  doi = {}
}