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Pham, H.Q., Le, V.S., Vu, M.H., Phan, M.Q.B., Nguyen, N.K. and Nguyen, Q.V. 2022. Research on the manufacture of equipment for detecting defects of disjointed, small diameter steel pipes by magnetic flux leakage method. Petrovietnam Journal. 3, (Apr. 2022), 26 - 34. DOI:https://doi.org/10.47800/PVJ.2022.03-04.