Geodesic
A tangent space in the sense of Busemann
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 6 (2005), pp. 71-75 
E. N. Sosov. A tangent space in the sense of Busemann. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 6 (2005), pp. 71-75. http://geodesic.mathdoc.fr/item/IVM_2005_6_a6/
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     title = {A tangent space in the sense of {Busemann}},
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     url = {http://geodesic.mathdoc.fr/item/IVM_2005_6_a6/}
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