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MR2376212 (2009d:53049a) 53C23 (53C70)
Foertsch, Thomas; Lytchak, Alexander; Schroeder, Viktor Nonpositive curvature and the Ptolemy inequality. Int. Math. Res. Not. IMRN 2007, no. 22, Art. ID rnm100, 15 pp.
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