%0 Journal Article %A Tavathia, B.S. %T Certain theorems in operational calculus involving integrals containing hyperbolic functions %J Portugaliae mathematica %D 1971 %P 21-28 %V 30 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/PORMA_1971__30_1_115134/ %G en %F PORMA_1971__30_1_115134