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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1918 Jul;4(7):189–193. doi: 10.1073/pnas.4.7.189

On the Representation of a Number as the Sum of any Number of Squares, and in Particular of five or seven

G H Hardy 1
PMCID: PMC1091440  PMID: 16576296

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