Geodesic
Closed copies of the rationals
Commentationes Mathematicae Universitatis Carolinae, Tome 28 (1987) no. 1, pp. 137-139

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Classification : 54B05, 54E52, 54E65, 54F65 
van Douwen, Eric K. Closed copies of the rationals. Commentationes Mathematicae Universitatis Carolinae, Tome 28 (1987) no. 1, pp. 137-139. http://geodesic.mathdoc.fr/item/CMUC_1987_28_1_a13/
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[H] W. HUREWICZ: Relativ perfekte Teile von Punktmengen und Mengen (A). Fund. Math. 12 (1928), 78-109.

[S] W. SIERPIŇSKI: Sur une propriété topologique des ensembles dénombrables denses en soi. Fund. Math. 1 (1920), 11-16.