1. Berdermann, E., Bosch, F., Clemente, M., Güttner, F., Kienle, P., Koenig, W., Kozhuharov, C., Martin, B., Povh, B., Tsertos, H., Wagner, W., Walcher, Th.: GSI Scientific Report 1980, GSI 81-2, p. 128
2. Bokemeyer, H., Folger, H., Grein, H., Ito, S., Schwalm, D., Vincent, P., Bethge, K., Gruppe, A., Waldschmidt, M., Schulé, R., Greenberg, J.S., Schweppe, J., Trautmann, N.: GSI Scientific Report 1980, GSI 81-2, p. 127
3. Reinhardt, J., Müller, U., Müller, B., Greiner, W.: Z. Physik A ? Atoms and Nuclei303, 173 (1981)
4. For the general theory of positron production in heavy ion collisions, see Reinhardt, J., Müller, B., Greiner, W.: Phys. Rev.A 24, 103 (1981)
5. Schlüter, P., Soff, G., Greiner, W.: Phys. Rep.75, 327 (1981)