On the representation of integers by sums of polynomials
L. K. Hua, On the representation of integers by sums of seven cubic functions, Tôhoku Math. J. vol. 41 (1935-1936) pp. 361-366.
Alvin Sugar, On a result of Hua for cubic polynomials, Bull. Amer. Math. Soc. vol. 47 (1941) pp. 164-165.
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