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@article{MM2_1988__60_2_155296, author = {Ludwig Br\"ocker}, title = {On the seperation of basic semialgebraic sets by polynomials.}, journal = {Manuscripta mathematica}, pages = {497--508}, publisher = {mathdoc}, volume = {60}, number = {2}, year = {1988}, zbl = {0647.14009}, url = {http://geodesic.mathdoc.fr/item/MM2_1988__60_2_155296/} }
Ludwig Bröcker. On the seperation of basic semialgebraic sets by polynomials.. Manuscripta mathematica, Tome 60 (1988) no. 2, pp. 497-508. http://geodesic.mathdoc.fr/item/MM2_1988__60_2_155296/