%0 Journal Article
%A P. D. Andreev
%T Geometric constructions in the class of Busemann nonpositively curved spaces
%J Žurnal matematičeskoj fiziki, analiza, geometrii
%D 2009
%P 25-37
%V 5
%N 1
%U http://geodesic.mathdoc.fr/item/JMAG_2009_5_1_a2/
%G en
%F JMAG_2009_5_1_a2