%0 Journal Article
%A A. Lelek
%A Jan Mycielski
%T Some conditions for a mapping to be a covering
%J Fundamenta Mathematicae
%D 1960
%P 295-300
%V 49
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/fm-49-3-295-300/
%R 10.4064/fm-49-3-295-300
%G en
%F 10_4064_fm_49_3_295_300