@article{CMUC_1980__21_2_a4,
     author = {Pytkeev, Evgenij G. and Yakovlev, N. N.},
     title = {On bicompacta which are unions of spaces defined by means of coverings},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {247--261},
     publisher = {mathdoc},
     volume = {21},
     number = {2},
     year = {1980},
     mrnumber = {580681},
     zbl = {0436.54018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1980__21_2_a4/}
}