%0 Journal Article %A A. S. Holevo %T Excessive maps, ``arrival times'' and perturbation of dynamical semigroups %J Izvestiya. Mathematics %D 1995 %P 1311-1325 %V 59 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM2_1995_59_6_a9/ %G en %F IM2_1995_59_6_a9