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@article{MAN_1980__251_163437, author = {Jacek Bochnak and Gustave Efroymson}, title = {Real {Algebraic} {Geometry} and the 17th {Hilbert} {Problem.}}, journal = {Mathematische Annalen}, pages = {213--242}, publisher = {mathdoc}, volume = {251}, year = {1980}, zbl = {0425.14004}, url = {http://geodesic.mathdoc.fr/item/MAN_1980__251_163437/} }
Jacek Bochnak; Gustave Efroymson. Real Algebraic Geometry and the 17th Hilbert Problem.. Mathematische Annalen, Tome 251 (1980), pp. 213-242. http://geodesic.mathdoc.fr/item/MAN_1980__251_163437/