1. N. L. Grigorov, V. S. Murzin, and I. D. Rapoport, Zh. Éksp. Teor. Fiz. 34, 506 (1958) [Sov. Phys. JETP 7, 348 (1958)].
2. I. P. Ivanenko, D. M. Podorozhnyi, I. D. Rapoport, et al., in Shower Theory (Mosk. Gos. Univ., Moscow, 1996), p. 102.
3. T. G. Guzik, J. Adams, J. Ampe, et al., in Proceedings of the 26th International Cosmic Ray Conference, ICRC, Salt Lake City, 1999, Vol. 5, p. 9.
4. I. D. Rapoport, A. N. Turundaevsky, and V. Ya. Shestoperov, Yad. Fiz. 65, 176 (2002) [Phys. At. Nucl. 65, 170 (2002)].
5. GEANT User's Guide, CERN DD/EE/83/1 (1983).