@article{GDZPPN002319489,
title = {Real Algebraic Geometry and the 17th Hilbert Problem.},
journal = {Mathematische Annalen},
volume = {250},
year = {1980},
pages = {213-242},
zbl = {0425.14004},
url = {http://dml.mathdoc.fr/item/GDZPPN002319489}
}
Bochnak, Jacek; Efroymson, Gustave. Real Algebraic Geometry and the 17th Hilbert Problem.. Mathematische Annalen, Tome 250 (1980) pp. 213-242. http://gdmltest.u-ga.fr/item/GDZPPN002319489/