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Bibliography

[1]

G. Aquaro, ``Point countable open coverings and countably compact spaces'' in General topology and its relations to modern analysis and algebra. II (Proc. Second Prague Topological Sympos., 1966) Academia, Prague, 1967, pp. 39-41. MR 38 #654.

[2]

J. Dugundji, Topology, Allyn and Bacon, Boston, Mass., 1966. MR 33 #1824. MR 0193606 (33:1824)

[3]

Z. Frolík, Sums of ultrafilters, Bull. Amer. Math. Soc. 73 (1967), 87-91. MR 34 #3525. MR 0203676 (34:3525)

[4]

T. Ganea, Symmetrische Potenzen topologischer Räume, Math. Nachr. 11 (1954), 305-316. MR 16, 503. MR 0065919 (16:503f)

[5]

L. Gillman and M. Jerison, Rings of continuous functions, Van Nostrand, Princeton, N. J., 1960. MR 22 #6994. MR 0116199 (22:6994)

[6]

V. M. Ivanova, On the theory of the space of subsets, Dokl. Akad. Nauk SSSR 101 (1955), 601-603. MR 16, 1041. (Russian) MR 0069479 (16:1041i)

[7]

K. Kuratowski, Topology. Vol. I, Academic Press, New York, 1966, pp. 160-182. MR 36 #840. MR 0217751 (36:840)

[8]

E. Michael, Topologies on spaces of subsets, Trans. Amer. Math. Soc. 71 (1951), 152-182. MR 13, 54. MR 0042109 (13:54f)

[9]

H. Wallman, Lattices and topological spaces, Ann. of Math. (2) 39 (1938), 112-126. MR 1503392