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@article{TRSPY_1965_76_a9, author = {Yu. D. Burago}, title = {On proportional approximation of a~metric}, journal = {Informatics and Automation}, pages = {120--123}, publisher = {mathdoc}, volume = {76}, year = {1965}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TRSPY_1965_76_a9/} }
Yu. D. Burago. On proportional approximation of a~metric. Informatics and Automation, Two-dimensional manifolds of bounded curvature. Part II. Collection of articles on the intrinsic geometry of surfaces, Tome 76 (1965), pp. 120-123. http://geodesic.mathdoc.fr/item/TRSPY_1965_76_a9/