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References:
[1] Uspenskij V. V.: A universal topological group with a countable base. Funktsional'nyj analiz i ego prilozhenija (Functional analysis and its applications) 20 (1986), 86-87. MR 0847156
[2] Katětov M.: On universal metric spaces. Proc. Sixth Prague Topological Symp. 1986, Frolík Z. (ed.), Berlin: Heldermann Verlag, 1988, pp. 323-330. MR 0952617
[3] Urysohn P.: Sur un espace métrique universel. Bull. Sci. Math. 51 (1927), 43-64.
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