M. . Ayoubi, M. . Naghizadeh, S. . Habibolah Tabatabaeian, and J. T. . Darian, “Identify the Main Knowledge Streams of Technological Learning in Joint R&D Projects in Petroleum Industry Based on Co-Word Method”, Nexo Scientific Journal, vol. 35, no. 02, pp. 611–625, Jun. 2022.