@article{MZ_1991__206_1_174240,
     author = {J.M. Gamboa and J.M. Ruiz},
     title = {On rings of semialgebraic functions.},
     journal = {Mathematische Zeitschrift},
     pages = {527--532},
     publisher = {mathdoc},
     volume = {206},
     number = {1},
     year = {1991},
     zbl = {0745.14022},
     url = {http://geodesic.mathdoc.fr/item/MZ_1991__206_1_174240/}
}