pourmandbakhshayesh, tayyebeh, Salmani, Behzad, bargioskooi, mohammadmehdi. “Effects of Technology Spillover and Internal Research & Development (R&D) on Growth of Total Factor Productivity (TFP) in Iran's Oil and Gas Sector.”  Roshd -e- Fanavari, vol. 16, no. 64, 2020, pp. 72-81. 10.52547/jstpi.20794.16.64.72