Measurement of Genuine Three-Particle Bose-Einstein Correlations in   Hadronic Z decay
  We measure three-particle Bose-Einstein correlations in hadronic Z decay with the L3 detector at LEP. Genuine three-particle Bose-Einstein correlations are observed. By comparing two- and three-particle correlations we find that the data are consistent with fully incoherent pion production. 
L3 Collaboration