1. Aikin, A.C. and McPeters, R.D., 1987, Geophys. Res. Lett., 13, 1300–1303.
2. Andreev, G.V., 1990. ACM III, Uppsala, 485–488.
3. Andreev, G.V., Rubtsov, L.N., Tarasova, I.I., 1988. Meteornye Issledovaniya No. 14, 49–59 and 60-68.
4. Andrianov, N.S., Vasilchenko, E.V., 1988. Radiotekh., 84, 83.
5. Babadzhanov, P.B., Obrubov, Y.V., Makhmudov, N., 1990. Astron. Vestnik 24, 18–28.