%0 Journal Article %A Benedetto Militello %A Paolo Aniello %A Antonino Messina %T Perturbative Treatment of the Evolution Operator Associated with Raman Couplings %J Symmetry, integrability and geometry: methods and applications %D 2006 %V 2 %U http://geodesic.mathdoc.fr/item/SIGMA_2006_2_a49/ %G en %F SIGMA_2006_2_a49