Production of fragments with in interaction of 12.7 GeV 4He+U, Pb, Au and Ag: track detector study Z. Todorović, S. Savović and S. Jokić Eur. Phys. J. A, 2 3 (1998) 295-300 Published online: 15 July 1998 DOI: 10.1007/s100500050122