@article{CMUC_2001__42_3_a8,
     author = {Arhangel'skii, A. V. and Ludwig, L.},
     title = {On $\alpha$-normal and $\beta$-normal spaces},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {507--519},
     publisher = {mathdoc},
     volume = {42},
     number = {3},
     year = {2001},
     mrnumber = {1860239},
     zbl = {1053.54030},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2001__42_3_a8/}
}