@article{
  author = {Mahmoodirad, A., Niroomand, S., Sanei, M., Sajedinejad, A.},
  title = {Lagrangian Relaxation Method for the Step fixed-charge Transportation Problem},
  journal = {Journal of New Researches in Mathematics},
  year = {2017},
  volume = {3},
  issue = {2},
  pages = {19-30},
  doi = {},
  url = {https://sanad.iau.ir/fa/Article/798727}
}