Geodesic
The fundamental problem of non-Riemannian geometry in a binary region
Doklady Akademii Nauk, Tome 140 (1961) no. 4, pp. 766-768 
P. I. Petrov. The fundamental problem of non-Riemannian geometry in a binary region. Doklady Akademii Nauk, Tome 140 (1961) no. 4, pp. 766-768. http://geodesic.mathdoc.fr/item/DAN_1961_140_4_a7/
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     author = {P. I. Petrov},
     title = {The fundamental problem of {non-Riemannian} geometry in a binary region},
     journal = {Doklady Akademii Nauk},
     pages = {766--768},
     year = {1961},
     volume = {140},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_140_4_a7/}
}
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