Surprises from Bose-Einstein correlations. I. V. Andreev, M. Plümer and R. M. Weiner in Phys. Rev. Lett. 67:3475 (1991).  What the paper says?

This discusses deviations of expected bosonic statistics in sub-atomic physics (namely, in pion productions), whereby distinguishable particles are more correlated than they should. Thermal states are assumed (pointing at interesting references to what seem cothermal states). They also mention relevance of squeezing in this context. The actual content of the paper is quite obscure to me, starting with the meaning of Eqs. (2) and their relation to Eqs. (1) (and how this relates to our reduced density matrices).