%0 Journal Article
%A Robert Gulliver
%T Branched Immersions of Surfaces and Reduction of Topological Type, I.
%J Mathematische Zeitschrift
%D 1975
%P 267-288
%V 145
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZ_1975__145_172290/
%F MZ_1975__145_172290