@article{
  author = {Hosseinzadeh, Farhad, Moghaddas, Zohreh},
  title = {Benchmarking Marketing Productivity Using Data Envelopment Analysis: a Modified Approach},
  journal = {Journal of System Management},
  year = {2017},
  volume = {3},
  number = {1},
  pages = {31-38},
  doi = {}
}