%0 Journal Article %A Dahiya, R.S. %T A theorem in unilateral operational calculus %J Portugaliae mathematica %D 1967 %P 309-317 %V 26 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/PORMA_1967__26_3_115033/ %G en %F PORMA_1967__26_3_115033