1. Proceedings of Int. Conf. Atomic and Nuclear Clusters, Santorini 1993. Anagnostatos, G.S., von Oertzen, W. (eds.) Berlin, Heidelberg, New York: Springer 1995
2. Proceedings of 6th International Conf. on Clusters in Nuclear Structure and Dynamics. Haas, F. (ed.) Strasbourg 1994
3. Brink, D.M., Enrico Fermi Course XXXVI, Varenna 1965 p. 247. Bloch, C. (ed.) New York: Academic Press 1966
4. Horiuchi, H., Ikeda, K., Suzuki, Y.: Prog. Theor. Phys. [Suppl] 52, 89 (1972)
5. Merchant, A.C., Rae, W.D.M.: Nucl. Phys. A549, 431 (1992); Z. Phys. A349, 243 (1994)