@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/}
}