%0 Journal Article
%A Ulrich Hirsch
%T On Regular Homotopy of Branched Coverings of the Sphere.
%J Manuscripta mathematica
%D 1977
%P 293-306
%V 21
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MM2_1977__21_154469/
%F MM2_1977__21_154469