PARTICLE PRODUCTION IN SUPERCRITICAL ELECTRIC FIELDS CREATED IN HEAVY ION COLLISIONS K. GEIGER, M. GRABIAK, W. GREINER, B. MÜLLER, J. REINHARDT, S. SCHRAMM et G. SOFF J. Phys. Colloques, 48 C9 (1987) C9-147-C9-155 DOI: 10.1051/jphyscol:1987924