%0 Journal Article
%A D. S. Malyshev
%T On intersection and symmetric difference of families of boundary classes in the problems on colouring and on the chromatic number
%J Diskretnaya Matematika
%D 2012
%P 75-78
%V 24
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DM_2012_24_2_a5/
%G ru
%F DM_2012_24_2_a5