@article{CMUC_2009__50_1_a9,
     author = {Alas, Ofelia T. and Tkachuk, Vladimir V. and Wilson, Richard G.},
     title = {Addition theorems, $D$-spaces and dually discrete spaces},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {113--124},
     publisher = {mathdoc},
     volume = {50},
     number = {1},
     year = {2009},
     mrnumber = {2562808},
     zbl = {1212.54074},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2009__50_1_a9/}
}