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@article{MAN_1977__230_163027, author = {Robert Gulliver}, title = {Branched {Immersions} of {Surfaces} and {Reduction} of {Topological} {Type.} {II.}}, journal = {Mathematische Annalen}, pages = {25--48}, publisher = {mathdoc}, volume = {230}, year = {1977}, zbl = {0338.57014}, url = {http://geodesic.mathdoc.fr/item/MAN_1977__230_163027/} }
Robert Gulliver. Branched Immersions of Surfaces and Reduction of Topological Type. II.. Mathematische Annalen, Tome 230 (1977), pp. 25-48. http://geodesic.mathdoc.fr/item/MAN_1977__230_163027/