1. Borisov, A.S. et al. (Pamir Collab.), Proc. 4th Int. Symp. on Very High Energy Cosmic Ray Interactions, Beijing, 1986, p. 4.
2. Ivanenko, I.P., Kopenkin, V.V., Managadze, A.K., et al., Pis’ma Zh. Eksp. Teor. Fiz., 1992, vol. 50, no. 11, p. 192.
3. Kopenkin, V.V., Managadze, A.K., Rakobolskaya, I.V., et al., Phys. Rev. D: Part. Fields, 1995, vol. 52, p. 2766.
4. Pamir Collab., Preprint of the Inst. Nucl. Phys., Moscow State Univ., Moscow, 1989, no. 89-67/144.
5. Borisov, A.S., Mukhamedshin, R.A., Puchkov, V.S., et al., Nucl. Phys. B, Proc. Suppl., 2001, vol. 97, p. 118.