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@article{10_4064_aa_9_1_79_82, author = {J. Cassels}, title = {On the representation of rational functions as sums of squares}, journal = {Acta Arithmetica}, pages = {79--82}, publisher = {mathdoc}, volume = {9}, number = {1}, year = {1964}, doi = {10.4064/aa-9-1-79-82}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-9-1-79-82/} }
J. Cassels. On the representation of rational functions as sums of squares. Acta Arithmetica, Tome 9 (1964) no. 1, pp. 79-82. doi : 10.4064/aa-9-1-79-82. http://geodesic.mathdoc.fr/articles/10.4064/aa-9-1-79-82/
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