Three steps in intranuclear cascading
  Between the initial excitation of nucleons by the passing throughout each other and the final cascading of newly created hadrons there should be considered one more step. We call it the second step cascading process. It acts as an interaction of wounded nucleon from one nucleus with another nucleon from the same nucleus. This mechanism leads to the significant increase on the inelasticity for nuclei collisions without changing the hadron-hadron interaction characteristics. 
Tadeusz Wibig (Univ. of Lodz)