BibTeX: |
@article{SumSquares-AFP,
author = {Roelof Oosterhuis},
title = {Sums of Two and Four Squares},
journal = {Archive of Formal Proofs},
month = aug,
year = 2007,
note = {\url{http://isa-afp.org/entries/SumSquares.html},
Formal proof development},
ISSN = {2150-914x},
}
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