@article{
  author = {asgari, heshmatolah, omidi, mohammadreza, malekinia, zahra, OMIDI, ALIAKBAR},
  title = {Forecasting of  OPEC's Global Crude Oil Demand using Vector Self-Engagement Models, Collective Exploration and Gravitational Search},
  journal = {Future study Management},
  year = {2019},
  volume = {29},
  number = {115},
  pages = {101-118},
  doi = {}
}