@article{10_1017_S0017089500031475,
     author = {Szafraniec, Zbigniew},
     title = {On the topological degree of real polynomial vector fields},
     journal = {Glasgow mathematical journal},
     pages = {221--231},
     year = {1996},
     volume = {38},
     number = {2},
     doi = {10.1017/S0017089500031475},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500031475/}
}