1. Beckerman, M.: Rep. Prog. Phys.51, 1047 (1988)
2. See for example: Dasso, C.H., Landowne, S., Winther, A.: Nucl. Phys.A405 381 (1983); Rhoades-Brown, M.J., Braun-M�nzinger, P.: Phys. Lett.136B, 19 (1984); Landowne, S., Pieper, S.C.: Phys. Rev.C29, 1352 (1984)
3. Esbensen, H., Landowne, S.: Phys. Rev.C35, 2090 (1987)
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5. Aguiar, C.E., Barbosa, V.C., Canto, L.F., Donangelo, R.: Phys. Lett.B201, 22 (1988); Phys. Rev.C38, 541 (1988)