  Azimuthal correlations between protons and between pions have been
investigated in central CNe, MgMg, CCu and OPb collisions at energy of 3.7
GeV/nucleon. "Back-to-back" (negative) correlations have been observed for
protons in CNe, CCu and for pi^{-}-mesons in CNe and MgMg collisions. For
pi^{-}-mesons "side-by-side" (positive) azimuthal correlations have been
observed for heavy systems of CCu and OPb. The Quark Gluon String Model
satisfactorily describes the experimental results both for protons and
pi^{-}-mesons.
