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@article{MZM_2001_69_2_a18, author = {V. I. Trofimov}, title = {On a {Property} of {Urysohn's} {Universal} {Metric} {Space}}, journal = {Matemati\v{c}eskie zametki}, pages = {319--320}, publisher = {mathdoc}, volume = {69}, number = {2}, year = {2001}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_2001_69_2_a18/} }
V. I. Trofimov. On a Property of Urysohn's Universal Metric Space. Matematičeskie zametki, Tome 69 (2001) no. 2, pp. 319-320. http://geodesic.mathdoc.fr/item/MZM_2001_69_2_a18/
[1] Uryson P. S., Trudy po topologii i drugim oblastyam matematiki, T. 2, Gostekhizdat, M., 1951, 747–777
[2] Trofimov V. I., Paul Erdös and his Mathematics, Research Communications of the Conference Held in the Memory of Paul Erdös, Janos Bolyai Math. Soc., Budapest, 1999, 255 | MR
[3] Urysohn P. S., Bull. Sci. Math., 51 (1927), 43–64; 74–90