%0 Journal Article %A I. E. Sharkawi %T The Formal Solution of Mikusinski Operational Differential Equations With Variable Coefficients %J Publications de l'Institut Mathématique %D 1989 %P 113 %V _N_S_46 %N 60 %I mathdoc %U http://geodesic.mathdoc.fr/item/PIM_1989_N_S_46_60_a16/ %G en %F PIM_1989_N_S_46_60_a16