%0 Journal Article %A F.M. Ragab %A T.M. MacRobert %T E-Function Series whose Sums are Constants. %J Mathematische Zeitschrift %D 1962 %P 231-234 %V 78 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZ_1962__78_170026/ %F MZ_1962__78_170026