%0 Journal Article
%A N. G. Parvatov
%T Lower and upper neighborhoods in set with closure property
%J Prikladnaâ diskretnaâ matematika
%D 2009
%P 5-13
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/PDM_2009_3_a0/
%G ru
%F PDM_2009_3_a0