  The influence of the HBT effect on the momentum spectra of independently
produced pions is studied using the method developed earlier for discussion of
multiplicity distributions. It is shown that in this case all the spectra and
multiparticle correlation functions are expressible in terms of one function of
two momenta. It is also shown that at the critical point all pions are
attracted into one quantum state and thus form a Bose-Einstein condensate.
