%0 Journal Article
%A Pyrih, Pavel
%T On the sense preserving mappings in the Helm topology in the plane
%J Serdica Mathematical Journal
%D 1999
%P 41-46
%V 25
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SMJ2_1999_25_1_a4/
%G en
%F SMJ2_1999_25_1_a4