%0 Journal Article
%A Yu. G. Ventsov
%T Effective selection operations on constructive and positive

%J Algebra i logika
%D 1993
%P 45-53
%V 32
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AL_1993_32_1_a3/
%G ru
%F AL_1993_32_1_a3