Velayati, Mohammad, Shahriari, Mohammadreza, Hosseinzadeh Lotfi, Farhad (2019). Classifying the Customers of Telecommunication Company in order to Identify Profitable Customers Based on Their First Transaction, Using Decision Tree: A Case Study of System 780. *Journal of Optimization in Industrial Engineering*, 12(2), 55-63. 10.22094/joie.2018.572783.1575