@article{GDZPPN002401495, title = {Vector Fields on Low Dimensional Manifolds.}, journal = {Mathematische Zeitschrift}, volume = {105}, year = {1968}, pages = {85-93}, zbl = {0162.55403}, url = {http://dml.mathdoc.fr/item/GDZPPN002401495} }
Thomas, Emery. Vector Fields on Low Dimensional Manifolds.. Mathematische Zeitschrift, Tome 105 (1968) pp. 85-93. http://gdmltest.u-ga.fr/item/GDZPPN002401495/