2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/48005Any-order pion interferometry formulas for fixed pion multiplicity events and for mixed events are given. Multipion Bose-Einstein correlation effects on the two-pion interferometry and source distribution are studied. It is shown that generalized pion interferometry formula should depneds on pion multiplicity distribution. Pion condensate is also discussed in the paper.invited Talk given at the 8-th international workshop on multiparticle production(correlation and fluctuation'98), June 14-21, 1998 Hungary. To be published in the proccedingHigh Energy Physics - PhenomenologyHigh Energy Physics - ExperimentNuclear ExperimentNuclear Theorytext