%0 Journal Article
%A A. B. Ugol'nikov
%T Depth of formulas in some classes of $k$-valued logic
%J Vestnik Moskovskogo universiteta. Matematika, mehanika
%D 1991
%P 44-47
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/VMUMM_1991_4_a10/
%G ru
%F VMUMM_1991_4_a10