%0 Journal Article
%A Bjarni Jonsson
%T Algebraic Extensions of Relational Systems.
%J Mathematica Scandinavica
%D 1962
%P 179-205
%V 11
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MS2_1962__11_165827/
%F MS2_1962__11_165827