1. Morinaga, H., Yamazaki, T.: In-beam gamma-ray spectroscopy. Amsterdam: North Holland 1976
2. Bohr, A., Mottelson, B.R.: Nuclear structure. Vol. 2. New York: Benjamin 1975
3. Mottelson, B.R.: Nikko Summer School Lectures, 1967, Nordita Publication No. 288
4. Suzuki, T.: Phys. Rev. C8, 2111 (1973); Nucl. Phys. A220, 569 (1974)
5. Zimányi, J., Halpern, I., Madsen, V.A.: Phys. Lett.33B, 205 (1970)