@article{
  author = {Emami Koupaee, Saeed, Zamani, Shiva, Heidarzadeh Hanzaee, A. Reza, Shahnazari, M. Reza},
  title = {Forecasting the Price of Natural Gas Using Developed Methods Based on Grays and Fractals},
  journal = {Financial Knowledge of Securities Analysis},
  year = {2020},
  volume = {13},
  number = {46},
  pages = {15-24},
  doi = {}
}