1. V. A. Troitskaya, Problems of Studying Variable Electromagnetic Fields [in Russian], Nauka, Moscow (1956).
2. V. A. Troitskaya and A. V. Gul’elmi, Usp. Fiz. Nauk, 97, 453–494 (1969).
3. O. M. Chugunova et al., Geomagn. Aeron., 21, No. 3, 210–228 (2005).
4. O. M. Chugunova, V. A. Pilipenko, S. L. Shalimov, and M. Engebretson, Geomagn. Aeron., 48, No. 3, 320–326 (2008).
5. M. A. Yakimuk and S. A. Kolesnik, in: Materials of the Fifteenth All-Russian Scientific Conf. Students-Physicists and Young Scientists (VNKSF-15), Tomsk (2009), pp. 425–426.