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[1] E. Čech: Bodové množiny. Academia, Praha 1974.
[2] F. Hausdorff: Mengenlehre. Walter de Gruyter and Co., Berlin W 10 and Leipzig 1927, pp. 245-247.
[3] J. Lukeš J. Malý L. Zajíček: Fine topology methods in real analysis and potential theory. to appear in Lecture Notes in Math. MR 0861411
[4] G. Petruska M. Laczkovich: Baire one functions, approximately continuous functions and derivatives. Acta Math. Acad. Sci. Hung. 25, 1974, pp. 189-212. DOI 10.1007/BF01901760 | MR 0379766
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