%0 Journal Article %A Gerald Kuba %T A mean value theorem on differences of two k-th powers of numbers in residue classes. %J Manuscripta mathematica %D 1991 %P 213-222 %V 72 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/MM2_1991__72_1_155639/ %F MM2_1991__72_1_155639