@article{JRAM_1991__417_153327,
     author = {J., Kucharz, W. Bochnak},
     title = {Polynomial mappings form products of algebraic sets into spheres.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {135--140},
     publisher = {mathdoc},
     volume = {417},
     year = {1991},
     zbl = {0721.14029},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1991__417_153327/}
}