1. Ivanov, V.E., Kirillov, A.S., Mal’kov, M.V., et al., Geomagn. Aeron., 1993, vol. 33, no. 5, p. 80.
2. Vorobyov, V.G., Kirillov, A.S., Katkalov, Yu.V., and Yagodkina, O.I, Geomagn. Aeron., 2013, vol. 53, no. 5, p. 711.
3. Spiro, R.V., Reiff, P.H., and Maher, L.J., J. Geophys. Res., 1982, vol. 87, no. A10, p. 8215.
4. Vorobyov, V.G. and Yagodkina, O.I, Geomagn. Aeron., 2005, vol. 45, no. 4, p. 438.
5. Vorobyov, V.G. and Yagodkina, O.I, Geomagn. Aeron., 2007, vol. 47, no. 2, p. 185.