%0 Journal Article %A Rinka Azuma %T Approximation theorem for evolution operators %J Studia Mathematica %D 2003 %P 195-206 %V 154 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm154-3-1/ %R 10.4064/sm154-3-1 %G en %F 10_4064_sm154_3_1