@article{01883664,
title = {Vector fields on nonorientable surfaces.},
journal = {International Journal of Mathematics and Mathematical Sciences},
volume = {2003},
year = {2003},
pages = {133-152},
doi = {10.1155/S0161171203204038},
zbl = {1011.30034},
language = {en},
url = {http://dml.mathdoc.fr/item/01883664}
}
Barza, Ilie; Ghisa, Dorin. Vector fields on nonorientable surfaces.. International Journal of Mathematics and Mathematical Sciences, Tome 2003 (2003) pp. 133-152. doi : 10.1155/S0161171203204038. http://gdmltest.u-ga.fr/item/01883664/