@article{EXMATH_1992_1992_1_a34,
     author = {Gonz\'alez-Vega, Laureano and Lombardi, Henri},
     title = {Nullstellensatz real y positivstellensatz para semipolinomios sobre un campo ordenado.},
     journal = {Extracta mathematicae},
     pages = {53-58},
     year = {1992},
     volume = {7},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_1992_1992_1_a34/}
}