Kopytenko, Y., V. Ismagilov, M. Hayakawa, N. Smirnova, V. Troyan, and T. Peterson. 2001. “Investigation of the ULFelectromagnetic Phenomena Related Toearthquakes: Contemporary Achievementsand the Perspectives”. Annals of Geophysics 44 (2). https://doi.org/10.4401/ag-3599.