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• Fedeli, Alessandro: On the $k$-Baire property. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 34 (1993), issue 3, pp. 525-527
• van Douwen, Eric K.: Closed copies of the rationals. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 28 (1987), issue 1, pp. 137-139