%0 Journal Article %A R. Syski %T Phase-type distributions and perturbation model %J Applicationes Mathematicae %D 1980 %P 377-399 %V 17 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/am-17-3-377-399/ %R 10.4064/am-17-3-377-399 %G fr %F 10_4064_am_17_3_377_399