Yin, X., Z. Gu, W. Wang, X. Zhang, X. Yuan, W. Li, and G. Chen. “Detection of Outer Wall Defects on Steel Pipe Using an Encircling Rotating Electromagnetic Field Eddy Current (RoFEC) Technique”. Strojniški Vestnik - Journal of Mechanical Engineering, vol. 68, no. 1, Jan. 2022, pp. 27-38, doi:10.5545/sv-jme.2021.7288.