@article{
  author = {nik khah sarnaghi, reza, Sheidaei Gourchin Qaleh, Mehdi },
  title = {Contracts of Build, Operate and Transfer in Free Trade of Iran},
  journal = {Quarterly Ethical Research (Association for Islamic Thought)},
  year = {2018},
  volume = {8},
  number = {30},
  pages = {231-244},
  doi = {}
}