%0 Journal Article
%A Heiner Zieschang
%T On the Homeotopy Groups of Surfaces.
%J Mathematische Annalen
%D 1973
%P 1
%V 206
%I mathdoc
%U https://geodesic-test.mathdoc.fr/item/MAN_1973__206_162503/
%G un
%F MAN_1973__206_162503