%0 Journal Article %A Gregers Krabbe %T Linear operators and operational calculus. Part I %J Studia Mathematica %D 1971 %P 199-223 %V 40 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-40-3-199-223/ %R 10.4064/sm-40-3-199-223 %G en %F 10_4064_sm_40_3_199_223