@article{CMUC_1988__29_2_a17,
     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/}
}