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1. E. ČECH, Topological Spaces, rev. ed., Prague, Academia, 1966. (1966) MR0211373
2. Z. FROLÍK, Sums of ultrafilters, Bull. Amer. Math. Soc. 73 (1967), 87-91. (1967) MR0203676
3. Z. FROLÍK, Types of ultrafliters on countable spaces, General Topology and its Relations to Modern Analysis and Algebra, II (Proc. Sympos., Prague, 1966), pp. 142-143. (1966) 
4. Z. FROLÍK, Homogeneity problems for extremally disconnected spaces, Comment. Math. Univ. Carolinae 8 (1967), 757-763. (1967) MR0264584
5. П. BOПEHKA, Построение моделей теории множеств методом ультрапроизведения, Z. Math. Logik Grundlagen Math. 8 (1962), 293-304. (1962) MR0146085

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