@article{CMUC_2000__41_1_a3,
     author = {Zhang, Dexue},
     title = {Tower extension of topological constructs},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {41--51},
     publisher = {mathdoc},
     volume = {41},
     number = {1},
     year = {2000},
     mrnumber = {1756925},
     zbl = {1038.54006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2000__41_1_a3/}
}