%0 Journal Article %A Raimond Struble %T A two-sided operational calculus %J Studia Mathematica %D 1977 %P 239-254 %V 60 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-60-3-239-254/ %R 10.4064/sm-60-3-239-254 %G en %F 10_4064_sm_60_3_239_254