%0 Journal Article
%A A. A. Fomin
%T Invariants and duality in some classes of torsion-free abelian
%J Algebra i logika
%D 1987
%P 63-83
%V 26
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AL_1987_26_1_a3/
%G ru
%F AL_1987_26_1_a3