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@article{MZM_1993_54_5_a4, author = {A. A. Zenkin}, title = {Waring's problem for sums of fourth powers of positive integers: $g(1,4)=21$}, journal = {Matemati\v{c}eskie zametki}, pages = {45--52}, publisher = {mathdoc}, volume = {54}, number = {5}, year = {1993}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1993_54_5_a4/} }
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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