“Investigating Risk Factors in Tender Process Effecting on Contract Implementation Stage in Onshore Oil and Gas Production Facilities Projects” (2019) International Journal of Engineering Research and Advanced Technology (ijerat) (E-ISSN 2454-6135) DOI: 10.31695/IJERAT, 5(12), pp. 08–27. doi:10.31695/IJERAT.2019.3584.