%0 Journal Article
%A D. A. Bochvar
%A V. I. Fukson
%T The operators of logical approximation
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1973
%P 65-77
%V 133
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TM_1973_133_a7/
%G ru
%F TM_1973_133_a7