1. Artukh, A.G., Gridnev, G.F., Mikheev, V.L., Volkov, V.V., Wilczynski, J.: Nucl. Phys. A215, 91 (1973)
2. Galin, J.: European Conference on Nuclear Physics with Heavy Ions, Caen (1976): J. Phys. C 537, 83 (1976) and references therein
3. Moretto, L.G., Schmitt, R.: European Conference on Nuclear Physics with Heavy Ions, Caen (1976): J. Phys. C537, 109 (1976)
4. N�renberg, W.: Z. Physik A274, 241 (1975) and A276, 84 (1976)
5. Ayik, S., Sch�rmann, B., N�renberg, W.: Z. Physik A277, 299 (1976)