%0 Journal Article
%A S. D. Denisov
%T Models of a noncontradictory formula and the hierarchy of Er\v{s}ov
%J Algebra i logika
%D 1972
%P 648-655
%V 11
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AL_1972_11_6_a2/
%G ru
%F AL_1972_11_6_a2