Pham, Hong Quang, Van Sy Le, Minh Hung Vu, Minh Quoc Binh Phan, Ngoc Khuong Nguyen, and Quang Vinh Nguyen. “Research on the Manufacture of Equipment for Detecting Defects of Disjointed, Small Diameter Steel Pipes by Magnetic Flux Leakage Method”. Petrovietnam Journal 30 (April 18, 2022): 26 - 34. Accessed June 6, 2023.