A Survey on Industry 4.0 for the Oil and Gas Industry: Upstream Sector. - Olakunle Elijah; Pang Ai Ling; Sharul Kamal Abdul Rahim; Tan Kim Geok; Agus Arsad; Evizal Abdul Kadir; Muslim Abdurrahman; Radzuan Junin; Augustine Agi; Mohammad Yasin Abdulfatah (IEEE Access, 2021)