1. 1. Mitra A. Vozdeystvie solnechnyh vspyshek na ionosferu Zemli [Effects of solar flares on the Earth's ionosphere]. M. : Mir, 1977. 370 p.
2. 2. Hargrivs Dzh. K. Verhnyaya atmosfera i solnechno-zemnye svyazi. Vvedenie v fiziku okolozemnoy kosmicheskoy sredy [The upper atmosphere and solar-terrestrial relations. Introduction to the physics of the near-Earth space environment] : per. na rus. yaz. Leningrad : Gidrometeoizdat, 1982. 352 p.
3. 3. Cummer S. A. Ionospheric D-region remote sensing using VLF radio atmospherics // Radio Science. 1998. V. 33, N 6. P. 1781-1792.
4. 4. Variatsii skorosti rasprostraneniya impulsnyh elektromagnityh signalov na trasse "Lovozero - Barentsburg" v SNCh diapazone [Variations of propagation velocity of the ELF electromagnetic pulses along the "Lovozero - Barentsburg" path] / O. M. Lebed, M. V. Kuznetsova, Yu. V. Fedorenko, A. V. Larchenko // Vestnik MGTU. 2014. V. 17, N 1. P. 204-212.
5. 5. Greifinger C., Greifinger P. Approximate method for determining ELF eigenvalues in the Earth - ionosphere cavity // Radio Science. 1978. V. 13. P. 831.