%0 Journal Article
%A A. A. Zenkin
%T Waring's problem for sums of fourth powers of positive integers: $g(1,4)=21$
%J Matematičeskie zametki
%D 1993
%P 45-52
%V 54
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZM_1993_54_5_a4/
%G ru
%F MZM_1993_54_5_a4