1. Bowman, C.D., Schr�der, I.G., Dick, C.E., Jackson, H.E.: Phys. Rev. C12, 863 (1975)
2. Zhuchko, V.E., Ignatyuk, A.V., Ostapenko, Yu.B., Smirenkin, G.N., Soldatov, A.S., Tsipenyuk, Yu.M.: Zh. Eksp. Teor. Fis. Pis'ma Red.22, 225 (1975) [JETP Lett.22, 118 (1975)]
3. Bellia, G., Calabretta, L., Del Zoppo, A., Ingrao, G., Migneco, E., Barna', R.C., De Pasquale, D.: Lett. Nuovo Cimento21, 373 (1978)
4. Bellia, G., Del Zoppo, A., Migneco, E., Barna', R.C., De Pasquale, D.: Phys. Rev. C20, 1059 (1979)
5. Goerlach, U., Habs, D., Just, M., Metag, V., Paul, P., Specht, H.J., Maier, H.J.: Z. Phys. A ? Atoms and Nuclei287, 171 (1978)