Geodesic
Waring's problem for sums of fourth powers of positive integers: $g(1,4)=21$
Matematičeskie zametki, Tome 54 (1993) no. 5, pp. 45-52 
A. A. Zenkin. Waring's problem for sums of fourth powers of positive integers: $g(1,4)=21$. Matematičeskie zametki, Tome 54 (1993) no. 5, pp. 45-52. http://geodesic.mathdoc.fr/item/MZM_1993_54_5_a4/
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     title = {Waring's problem for sums of fourth powers of positive integers: $g(1,4)=21$},
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     url = {http://geodesic.mathdoc.fr/item/MZM_1993_54_5_a4/}
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