%0 Journal Article
%A R. I. Grigorchuk
%T On the topological and metric types of surfaces regularly covering a~closed surface
%J Izvestiya. Mathematics 
%D 1990
%P 517-553
%V 34
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM2_1990_34_3_a1/
%G en
%F IM2_1990_34_3_a1