1. S. K. Abdullaev, A. I. Mukhtarov, A. T. Khalil-Zade, and P. Radzhabov, Uch. Zap. Azerbaidzh. Gos. Univ., 2, 118 (1977).
2. N. A. Guliev, Preprint No. 51 of the Institute of Physics, Academy of Sciences of the Azerbaidzhan SSR, Baku (1977).
3. E. Kh. Khristova, Yad. Fiz.,25, 154 (1977).
4. E. Kh. Khristova, Yad. Fiz.,25, 466 (1977).
5. O. P. Sushkov et al., Yad. Fiz.,20, 1016 (1974).