  We discuss the implementations of the Bose-Einstein effect from asymmetric
sources in Monte Carlo generators. A comparison of LEP data with results from
the PYTHIA/JETSET code with the standard procedure imitating the effect and
with the results from the weight method
  (with weights depending in various ways on components of momenta differences)
is presented. We show that in this last method one can reproduce the
experimental hierarchy of the source radii.
