%0 Journal Article %A Jolanta Olko %T On semigroups with an infinitesimal operator %J Annales Polonici Mathematici %D 2005 %P 77-89 %V 85 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap85-1-6/ %R 10.4064/ap85-1-6 %G en %F 10_4064_ap85_1_6