A counterexample to the seperation of semialgebraic sets.
Fortuna, E. ; Galbiati, M.
Mathematica Scandinavica, Tome 69 (1991), p. 161-165 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1991-01-01
EUDML-ID : urn:eudml:doc:167175 
@article{GDZPPN002361213,
     title = {A counterexample to the seperation of semialgebraic sets.},
     journal = {Mathematica Scandinavica},
     volume = {69},
     year = {1991},
     pages = {161-165},
     url = {http://dml.mathdoc.fr/item/GDZPPN002361213}
}

Fortuna, E.; Galbiati, M. A counterexample to the seperation of semialgebraic sets.. Mathematica Scandinavica, Tome 69 (1991) pp. 161-165. http://gdmltest.u-ga.fr/item/GDZPPN002361213/