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@article{JRAM_1977__296_151929, author = {T.M. Viswanathan}, title = {Ordered fields and sign-changing polynomials.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {1--9}, publisher = {mathdoc}, volume = {296}, year = {1977}, zbl = {0356.12028}, url = {http://geodesic.mathdoc.fr/item/JRAM_1977__296_151929/} }
T.M. Viswanathan. Ordered fields and sign-changing polynomials.. Journal für die reine und angewandte Mathematik, Tome 296 (1977), pp. 1-9. http://geodesic.mathdoc.fr/item/JRAM_1977__296_151929/