1. N.Z. Akopov, K.A. Ispirian, M.K. Ispirian, V.G. Khachatryan, in: N. Giglietto, P. Spinelli (Eds.), Proceedings of TRD-2001, Workshop, Bari, Italy, Sept. 2001, Frascati Physics Series, INFN Laboratori Nazionoli di Frascati, 2002, Vol. XXV, p. 59.
2. I.M. Frank, Izluchenie Vavilova-Cherenkova, Voprosi Teorii, Nauka, Moscow 1988 (in Russian).