1. M.R. Adams et al., Phys. Rev. D27, 1977 (1983)
2. D. Blockus et al., Nucl. Phys. B201, 205 (1982)
3. S. Mikamo et al., Phys. Lett. B106, 428 (1981).
4. H.J. Specht, ”Direct Photons and Lepton Pairs in pp, pA and AA above 10 GeV/c”, these proceedings.
5. W. König, ”Subthreshold Antiproton Production and Dilepton Production”, these proceedings.