%0 Journal Article
%A S. V. Yablonskii
%T The structure of the upper neighborhood for predicate-describable classes in $P_k$
%J Doklady Akademii Nauk
%D 1974
%P 304-307
%V 218
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1974_218_2_a14/
%G ru
%F DAN_1974_218_2_a14