Based on an analysis of the formation mechanism of induced current in underground pipelines, theauthor holds that, where underground media show very poor conductance, underground pipelines are dominated bymagnetic dipole lines, and where underground media have certain conductance, pipelines are equivalent to electricwires.
阮百尧. 感应法地下管线探测中的一个问题[J]. 物探与化探, 1997, 21(5): 382-385,393.
Ruan Bairao. A PROBLEM IN THE DETECTION OF UNDERGROUND PIPELINES WITH INDUCTIVE METHOD. Geophysical and Geochemical Exploration, 1997, 21(5): 382-385,393.