Winding Numbers on Surfaces, I.
Mathematische Annalen, Tome 196 (1972), pp. 218-249.

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@article{MAN_1972__196_162255,
     author = {D.B.J. Chillingworth},
     title = {Winding {Numbers} on {Surfaces,} {I.}},
     journal = {Mathematische Annalen},
     pages = {218--249},
     publisher = {mathdoc},
     volume = {196},
     year = {1972},
     zbl = {0221.57001},
     url = {http://geodesic.mathdoc.fr/item/MAN_1972__196_162255/}
}
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D.B.J. Chillingworth. Winding Numbers on Surfaces, I.. Mathematische Annalen, Tome 196 (1972), pp. 218-249. http://geodesic.mathdoc.fr/item/MAN_1972__196_162255/