%0 Journal Article
%A L. N. Romakina
%T Hyperbolic parallelograms of the plane $\widehat H$
%J Izvestiya of Saratov University. Mathematics. Mechanics. Informatics
%D 2013
%P 43-52
%V 13
%N 3
%U http://geodesic.mathdoc.fr/item/ISU_2013_13_3_a5/
%G ru
%F ISU_2013_13_3_a5