%0 Journal Article
%A P. D. Andreev
%A V. V. Starostina
%T Normed planes in tangent cone to chord space of nonpositive curvature
%J Izvestiâ vysših učebnyh zavedenij. Matematika
%D 2019
%P 3-17
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IVM_2019_1_a0/
%G ru
%F IVM_2019_1_a0