Unified Description of Freeze-Out Parameters in Relativistic Heavy Ion   Collisions
  It is shown that the chemical freeze-out parameters obtained at CERN/SPS, BNL/AGS and GSI/SIS energies all correspond to a unique value of 1 GeV per hadron in the local rest frame of the system, independent of the beam energy and of the target and beam particles. 
J. Cleymans and K. Redlich