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Bibliography

[1]

M. Day, Oriented systems, Duke Math. J. 11 (1944), 201-229. MR 0009970 (5:231c)

[2]

S. Ginsburg, A class of everywhere branching sets, Duke Math. J. 20 (1953), 521-526. MR 0058685 (15:409g)

[3]

J. Isbell, Supercomplete spaces, Pacific J. Math. 12 (1962), 287-290. MR 0156311 (27:6235)

[4]

S. MacLane, Homology, Academic Press, New York, 1963. MR 0156879 (28:122)

[5]

J. Tukey, Convergence and uniformity in topology, Annals of Mathematics Studies No. 2, Princeton Univ. Press, Princeton, N. J., 1940. MR 0002515 (2:67a)