1. Borog, V.V., et al., Proc. 24th ICRC, Roma, 1995, vol. 4, p. 1291.
2. Barbashina, N.S., et al., Prib. Tekh. Eksp., 2008, no. 2, p. 26.
3. Dmitrieva, A.N., et al., Astropart. Phys., 2011, vol. 34, p. 401.
4. Timashkov, D.A., et al., Proc. 21st ECRS, Koshice, 2008, p. 338.
5. Shutenko, V.V., et al., Proc. 23rd ECRS, Moscow, 2012.