1. Proceedings of the Symposium on Four Nucleon Correlations and?-Rotator Structure, Ed. Stock, R., Marburg (1972) Proceedings of the First Louvain-Cracow Seminar on the Alpha-Nucleus Interaction, Cracow, Poland (1973)
2. Stock, R., Gaul, G., Santo, R., Bernas, M., Harvey, B., Hendrie, D., Mahoney, J., Sherman, J., Steyaert, J., Zisman, M.: Phys. Rev. C6, 1226 (1972)
3. Friedrich, H., Langanke, K.: Nucl. Phys. A252, 47 (1975)
4. Davies, R.H., John, J., Robinson, C.P., Aldrige, J.P.: Phys. Rev.177, No 4, 1755 (1969)
5. Bisson, A.E., Eberhard, K.A., Davies, R.H.: Phys. Rev. C1, No 2, 539 (1970)