1. P. Jesinger, G. V. Danilyan, A. M. Gagarski et al., Yad. Fiz. 62, 1723 (1999) [Phys. Atom. Nucl. 62, 1608 (1999)].
2. B. G. Erozolimskii, Yu. A. Mostovoi, V. P. Fedunin et al., Yad. Fiz. 28, 98 (1978) [Sov. J. Nucl. Phys. 28, 48 (1978)].
3. M. I. Bulgakov, G. V. Danilyan, A. D. Gulko et al., Phys. Lett. B 42, 351 (1978).
4. V. V. Valdimirskii and V. N. Andreev, Zh. Éksp. Teor. Fiz. 41, 663 (1961) [Sov. Phys. JETP 14, 475 (1962)].
5. G. V. Danilyan, Usp. Fiz. Nauk 131, 329 (1980) [Sov. Phys. Usp. 23, 323 (1980)].