MathSciNet bibliographic data MR1423021 58F17 (20F32 53C35 58F11) Bourdon, Marc Sur le birapport au bord des ${\rm CAT}(-1)$${\rm CAT}(-1)$-espaces. (French) [On the cross-ratio at the boundary of ${\rm CAT}(-1)$${\rm CAT}(-1)$-spaces] Inst. Hautes Études Sci. Publ. Math. No. 83 (1996), 95–104. Article

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