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A. Schinzel 1
@article{10_4064_ba61_2_3, author = {A. Schinzel}, title = {On {Sums} of {Four} {Coprime} {Squares}}, journal = {Bulletin of the Polish Academy of Sciences. Mathematics}, pages = {109--111}, publisher = {mathdoc}, volume = {61}, number = {2}, year = {2013}, doi = {10.4064/ba61-2-3}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/ba61-2-3/} }
A. Schinzel. On Sums of Four Coprime Squares. Bulletin of the Polish Academy of Sciences. Mathematics, Tome 61 (2013) no. 2, pp. 109-111. doi : 10.4064/ba61-2-3. http://geodesic.mathdoc.fr/articles/10.4064/ba61-2-3/
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