Comment on "Multi-phonon Raman scattering in semiconductor nanocrystals:   Importance of non-adiabatic transitions"
  In a recent paper [E. P. Pokatilov et al, PRB 65, 075316 (2002) the Raman selection rules in spherical nanocrystals with a degenerate valence band are analyzed. Some precisions are given here. 
Eduardo Menendez-Proupin