Levashov, S. P., N. A. Yakymchuk, and I. N. Korchagin. 2012. “Frequency-Resonance Principle, Mobile Geoelectric Technology: New Paradigm of Geophysical Investigations”. Geofizicheskiy Zhurnal 34 (4):166-76. https://doi.org/10.24028/gzh.0203-3100.v34i4.2012.116766.