%0 Journal Article
%A Pöschel, Reinhard
%A Wessel, Walter
%T Classes of graphs definable by graph algebra identities or quasi-identities
%J Commentationes Mathematicae Universitatis Carolinae
%D 1987
%P 581-592
%V 28
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMUC_1987__28_3_a18/
%G en
%F CMUC_1987__28_3_a18