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References:
[1] W. W, Comfort S. Negrepontis: The theory of ultrafilteгs. Springer-Veгlag, Berlin-Heidel- berg-New York, 1974. MR 0396267
[2] G. Grimeisen: Gefilterte Summation von Filtern und iterierte Grenzprozesse I. Math. Ann. 141 (1960), 318-342. MR 0120613 | Zbl 0096.26201
[3] M. Katětov: On descriptive classification of functions. General Topology and its Relations to Modern Analysis and Algebra III (Proc. 1971 Prague Topological Symposium), pp. 235-242. Academia, Pгague, 1972. MR 0355956
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