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@article{MAN_1972__199_162320, author = {D.R.J. Chillingworth}, title = {Winding {Numbers} on {Surfaces} {II.} {Applications.}}, journal = {Mathematische Annalen}, pages = {131--154}, publisher = {mathdoc}, volume = {199}, year = {1972}, zbl = {0231.57002}, url = {http://geodesic.mathdoc.fr/item/MAN_1972__199_162320/} }
D.R.J. Chillingworth. Winding Numbers on Surfaces II. Applications.. Mathematische Annalen, Tome 199 (1972), pp. 131-154. http://geodesic.mathdoc.fr/item/MAN_1972__199_162320/