%0 Journal Article %A Enrico Leuzinger %T On the trigonometry of symmetric spaces. %J Commentarii mathematici Helvetici %D 1992 %P 252-286 %V 67 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMH_1992__67_3_140268/ %F CMH_1992__67_3_140268