@article{
  author = {Yousefikhoshbakht, Majid, Didehvar, Frazad, Rahmati, Farhad},
  title = {A Mixed Integer Programming Formulation for the Heterogeneous Fixed Fleet Open Vehicle Routing Problem},
  journal = {Journal of Optimization in Industrial Engineering},
  year = {2015},
  volume = {8},
  number = {18},
  pages = {37-46},
  doi = {}
}