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@article{MZ_1975__145_172290, author = {Robert Gulliver}, title = {Branched {Immersions} of {Surfaces} and {Reduction} of {Topological} {Type,} {I.}}, journal = {Mathematische Zeitschrift}, pages = {267--288}, publisher = {mathdoc}, volume = {145}, year = {1975}, zbl = {0299.57014}, url = {http://geodesic.mathdoc.fr/item/MZ_1975__145_172290/} }
Robert Gulliver. Branched Immersions of Surfaces and Reduction of Topological Type, I.. Mathematische Zeitschrift, Tome 145 (1975), pp. 267-288. http://geodesic.mathdoc.fr/item/MZ_1975__145_172290/