Geodesic
The class of $\aleph$-spaces is invariant of closed mappings with Lindelöf fibres
Commentationes Mathematicae Universitatis Carolinae, Tome 29 (1988) no. 2, pp. 351-354.

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Classification : 54C10, 54E18 
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     author = {Sun, Shu Hao},
     title = {The class of $\aleph$-spaces is invariant of closed mappings with {Lindel\"of} fibres},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {351--354},
     publisher = {mathdoc},
     volume = {29},
     number = {2},
     year = {1988},
     mrnumber = {957403},
     zbl = {0656.54021},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1988__29_2_a17/}
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Sun, Shu Hao. The class of $\aleph$-spaces is invariant of closed mappings with Lindelöf fibres. Commentationes Mathematicae Universitatis Carolinae, Tome 29 (1988) no. 2, pp. 351-354. http://geodesic.mathdoc.fr/item/CMUC_1988__29_2_a17/