Kopytenko, Y., V. Ismagilov, M. Hayakawa, N. Smirnova, V. Troyan, and T. Peterson. “Investigation of the ULFelectromagnetic Phenomena Related Toearthquakes: Contemporary Achievementsand the Perspectives”. Annals of Geophysics, vol. 44, no. 2, Dec. 2001, doi:10.4401/ag-3599.