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References:
[1] KELLEY J. L.: General Topology. D. VAN NOSTRAND COMPANY, NEW YORK 1955. MR 0070144 | Zbl 0066.16604
[2] ZUZČÁK I.: Generalized topological spaces. Math. Slovaca, 33, 1983, 249--256. MR 0713948 | Zbl 0533.54001
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