Finite coherent length and multi-pion correlation effects on two-pion   interferometry
  The effects of multi-pion correlations and finite coherent length on two-pion interferometry are studied. It was shown that as the pion multiplicity and coherent length become larger, the apparent radius and the apparent coherent parameters derived from two-pion interferometry become smaller. The influence of the coherent length on the effective temperature is discussed. 
Q. H. Zhang, X.Q. Li, C.S. Gao and W.Q. Chao