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[BPS] B. BALCAR J. PELANT P. SIMON: The space of ultrafilters on $N$ covered by nowhere dense sets. to appear. MR 0600576
[CN] W. W. COMFORT S. NEGREPONTIS: The Theory of Ultrafilters. Springer-Verlag, Berlin - Heidelberg - New York 1974. MR 0396267
[M] E. W. MILLER: A note on Souslin's problem. Amer. J. Math. 65 (1943), 674-678. MR 0009615 | Zbl 0060.12701
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