[en] The results are briefly described of three experiments on the Dubna synchrophasotron which accelerated deuterium, helium, and carbon ions to energies of up to about 50 GeV or 4.5 GeV per nucleon. Secondary particles were detected by track detectors each consisting of nuclear emulsion, a 2 m streamer chamber with thin metallic targets inside and a 2 m propane bubble chamber with heavy metal plates inside. Preliminary results are reported of the probability for the production of a given number of pions minus as a function of the average pion minus multiplicity for hadron-hadron, hadron-nucleus and alfa-nucleus collisions, and the average number of pions minus produced in nucleus-target interactions, normalized to the same average proton-target interactions as a functions of average number of participating nucleus from the beam. (Z.J.)