%0 Journal Article
%A V. I. Amstislavskii
%T On recursive characterizations of sets obtainable by means of $R^c$-operations
%J Doklady Akademii Nauk
%D 1975
%P 257-260
%V 224
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1975_224_2_a0/
%G ru
%F DAN_1975_224_2_a0