  The basics and the formalism of Bose-Einstein correlations is briefly
reviewed. The invariant Buda-Lund form is summarized. Tools are presented that
can be utilized in a model-independent search for non-Gaussian structuctures in
the two-particle Bose-Einstein correlation functions. The binary source
formalism of particle interferometry is presented and related to oscillations
in the two-particle Bose-Einstein and Fermi-Dirac correlation functions. The
frequency of the observed oscillations in the NA49 two-proton correlation
function in Pb+Pb collisions at CERN SPS energies is explained with the help of
the reconstructed space-time picture of particle production and the binary
nature of the proton source in this reaction.
