1. Mang, H.J.: Phys. Rev.119, 1063 (1960)
2. Zeh, H.D.: Z. Physik175, 490 (1963)
3. Feshbach, H.: Documents on modern physics, Reaction Dynamics. New York: Gordon and Breach 1973
4. Saito, S., Okai, S., Tamagaki, R., Yasuno, M.: Progr. Theor. Phys.50, 1561 (1973)
5. Griffin, J.J., Wheeler, J.A.: Phys. Rev.108, 312 (1957)