@article{
  author = {Tohidi, G., Razavyan, S., Tohidnia, S.},
  title = {A generalized cost Malmquist index to compare the productivities of units with negative data in DEA},
  journal = {Journal of Linear and Topological Algebra},
  year = {2014},
  volume = {3},
  issue = {2},
  pages = {115-120},
  doi = {},
  url = {https://sanad.iau.ir/fa/Article/1081039}
}