%0 Journal Article
%A D. K. Rao
%T A triangle inequality for angles in a Hilbert space
%J Revista colombiana de matematicas
%D 1976
%P 95-98
%V 10
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RCM_1976__10_181652/
%F RCM_1976__10_181652