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References:
[1] M. KATĚTOV: On descriptive classes of functions. Theory of sets and topology (in honour of F. Hausdorff), pp. 265-278. Berlin 1972. MR 0345060
[2] M. KATĚTOV: On descriptive classification of functions. General Topology and its Relations to Modern Analysis and Algebra III (Proc. Prague Top. Symp. 1971), pp. 235-242. Prague 1972. MR 0355956
[3] K. KURATOWSKI: Topology. vol. I. New York, London, Warsaw 1966. MR 0217751 | Zbl 0163.17002
[4] J. NAGATA: Some theorems on generalized metric spaces. Theory of sets and topology (in honour of F. Hausdorff), pp. 377-390. Berlin 1972. MR 0341425 | Zbl 0277.54032
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