1. Azuma, R.E., Carrax, L.C., Hansen, P.G., Jonson, B., Kratz, K.-L., Mattsson, S., Nyman, G., Ohm, H., Ravn, H.L., Schr�der, A., Ziegert, W.: Phys. Rev. Lett.43, 1652 (1979)
2. Detraz, C., Epherrs, M., Guillemaud, D., Hansen, P.G., Jonson, B., Klapisch, R., Langevin, M., Mattsson, S., Naulin, F., Nyman, G., Poskanzer, A.M., Ravn, H.L., de Saint-Simon, M., Takahashi, K., Thibault, C., Touchard, F.: Phys. Lett.94B, 307 (1980)
3. Migdal, A.B.: Theory of finite Fermi-systems and applications to atomic nuclei. New York: Wiley 1967
4. Gaponov, Yu.V., Lyutostansky, Yu.S.: Sov. Phys. Particles Nucl.12, 1324 (1981); Yad. Fiz.19, 62 (1974)
5. Aleksankin, V.G., Lyutostansky, Yu.S., Sirotkin, V.K.: Neutron Physics. Fifth Conference on Neutron Physics (Kiev 1980), Vol. 3, pp. 124?128. Moscow: CNIIatominform 1980