@article{10_1090_S0894_0347_99_00302_1,
     author = {Acquistapace, F. and Andradas, C. and Broglia, F.},
     title = {Separation of semialgebraic sets},
     journal = {Journal of the American Mathematical Society},
     pages = {703--728},
     year = {1999},
     volume = {12},
     number = {3},
     doi = {10.1090/S0894-0347-99-00302-1},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-99-00302-1/}
}