%0 Journal Article %A Hartzstein, Silvia I. %A Viviani, Beatriz E. %T On the composition of the integral and derivative operators of functional order %J Commentationes Mathematicae Universitatis Carolinae %D 2003 %P 99-120 %V 44 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMUC_2003__44_1_a8/ %G en %F CMUC_2003__44_1_a8