%0 Journal Article
%A A. I. Subbotin
%T On a~property of the subdifferential
%J Sbornik. Mathematics
%D 1993
%P 63-78
%V 74
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_1993_74_1_a5/
%G en
%F SM_1993_74_1_a5