%0 Journal Article
%A E. A. Konovalchik
%A K. V. Kostousov
%T Symmetrical $2$-extensions of a $2$-dimensional grid.~I
%J Trudy Instituta matematiki i mehaniki
%D 2016
%P 159-179
%V 22
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TIMM_2016_22_1_a15/
%G ru
%F TIMM_2016_22_1_a15