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Sun, Shu Hao
The class of $\aleph$-spaces is invariant of closed mappings with Lindelöf fibres. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 29 (1988), issue 2, pp. 351-354
MSC: 54C10, 54E18 | MR 957403 | Zbl 0656.54021
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