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

Proceedings of the National Academy of Sciences of the United States of America

PubMedID: 16576296

Hardy GH. On the Representation of a Number as the Sum of any Number of Squares, and in Particular of five or seven. Proc Natl Acad Sci USA. 1918;4(7):189-93.
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