1. B. E. Bryunelli and A. A. Namgaladze, Physics of the Ionosphere (Nauka, Moscow, 1988) [in Russian].
2. W. K. Hocking, J. Atmos. Terr. Phys. 58, 735 (1996).
3. V. V. Belikovich, E. A. Benediktov, A. V. Tolmacheva, and N. V. Bakhmet’eva, Ionospheric Research by Means of Artificial Periodic Irregularities (IPF RAN, Nizh. Novgorod, 1999) [in Russian].
4. V. V. Belikovich, E. A. Benediktov, A. V. Tolmacheva, et al., Ionospheric Research by Means of Artificial Periodic Irregularities (Copernicus, Katlenburg-Lindau, Germany, 2002).
5. A. A. Khanan’yan, in Study of Dynamic Processes in Upper Atmosphere, Ed. by I. A. Lysenko (Gidrometeoizdat, Moscow, 1985), p. 59 [in Russian].