%0 Journal Article
%A S. V. Ivanov
%T Distance difference functions on nonconvex boundaries of Riemannian manifolds
%J Algebra i analiz
%D 2021
%P 81-92
%V 33
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AA_2021_33_1_a3/
%G ru
%F AA_2021_33_1_a3