Shuman, V.N., V. P. Kobolev, V. I. Starostenko, I. B. Burkinskiy, N. P. Loyko, I. G. Zakharov, and D. A. Yatsiuta. “A Method of Analysis of Spontaneous Electromagnetic Emission of the Earth: Physical Backgrounds, Elements of Theory, Field Experiment”. Geofizičeskij žurnal 34, no. 4 (August 1, 2012): 40–61. Accessed June 25, 2024. https://journals.uran.ua/geofizicheskiy/article/view/116749.