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@article{TRSPY_1951_38_a1, author = {A. D. Aleksandrov}, title = {A theorem on triangles in a metric space and some of its applications}, journal = {Informatics and Automation}, pages = {5--23}, publisher = {mathdoc}, volume = {38}, year = {1951}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TRSPY_1951_38_a1/} }
A. D. Aleksandrov. A theorem on triangles in a metric space and some of its applications. Informatics and Automation, Trudy Matematicheskogo Instituta imeni V. A. Steklova, Tome 38 (1951), pp. 5-23. http://geodesic.mathdoc.fr/item/TRSPY_1951_38_a1/