%0 Journal Article
%A V. P. Orevkov
%T Undecidable classes of formulas for the constructive predicate calculus.~I
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1972
%P 100-108
%V 121
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TM_1972_121_a5/
%G ru
%F TM_1972_121_a5