%0 Journal Article %A Naoki Tanaka %T A characterization of evolution operators %J Studia Mathematica %D 2001 %P 285-299 %V 146 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm146-3-5/ %R 10.4064/sm146-3-5 %G en %F 10_4064_sm146_3_5