Bose-Einstein effect from asymmetric sources in Monte Carlo generators
  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. 
K. Fialkowski and R. Wit