1. Dudek, J., Nazarewicz, W.: Phys. Rev. C31, 298 (1985)
2. Twin, P.J., Nyako, B.M., Nelson, A.H., Simpson, J., Bentley, M.A., Cranmer-Gordon, H.W., Forsyth, P.D., Howe, D., Mokhtar, A.R., Morrison, J.D., Sharpey-Schafer, J.F., Sletten, G.: Phys. Rev. Lett.57, 811 (1986)
3. See for instance. The variety of nuclear shapes. Proc. Int. Conf. on Nuclear Shapes, Crete. Garrett, J.D., et al. (eds.) Singapore: World Scientific 1988
4. Bengtsson, T., Ragnarsson, I.: Nucl. Phys. A436, 14 (1985)
5. Ragnarsson, I., Aberg, S.: Phys. Lett. B180, 191 (1986)