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Hardy, G. H.; Littlewood, J. E. (1922). "Some problems of Partitio Numerorum: IV. The singular series in Waring's Problem and the value of the number G(k)". Mathematische Zeitschrift. 12 (1): 161–188. doi:10.1007/BF01482074. ISSN0025-5874.
Vaughan, R. C. (1989). "A new iterative method in Waring's problem". Acta Mathematica. 162: 1–71. doi:10.1007/BF02392834. ISSN0001-5962.
Deshouillers, Jean-Marc; Kawada, Koichi; Wooley, Trevor D. (2005). "On Sums of Sixteen Biquadrates". Mémoires de la Société Mathématique de France. 1: 1–120. doi:10.24033/msmf.413. ISSN0249-633X.