@article{JRAM_1987__377_152933,
     author = {J. Bochnak and W. Kucharz},
     title = {Realization of homotopy classes by algebraic mappings.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {159--169},
     publisher = {mathdoc},
     volume = {377},
     year = {1987},
     zbl = {0619.14014},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1987__377_152933/}
}