Geodesic
The proof of Busemann conjecture for $G$-spaces with non-positive curvature
Algebra i analiz, Tome 26 (2014) no. 2, pp. 1-20.

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P. D. Andreev. The proof of Busemann conjecture for $G$-spaces with non-positive curvature. Algebra i analiz, Tome 26 (2014) no. 2, pp. 1-20. http://geodesic.mathdoc.fr/item/AA_2014_26_2_a0/

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