Separable extensions of first countable spaces
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Eric van Douwen, Teodor Przymusiński (1980)
Fundamenta Mathematicae
Harald Brandenburg (1989)
William Fleissner (1978)
Fundamenta Mathematicae
F. D. Tall (1977)
Watson, Stephen W. (1984)
Proceedings of the 11th Winter School on Abstract Analysis
Eric van Douwen, Michael Wage (1979)
Fundamenta Mathematicae
Dennis Burke (1983)
Fundamenta Mathematicae
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