@article{CMUC_2012__53_1_a6,
     author = {Gaspar-Arreola, M.\'A. and Hern\'andez-Hern\'andez, F.},
     title = {The product of two ordinals is hereditarily dually discrete},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {99--104},
     publisher = {mathdoc},
     volume = {53},
     number = {1},
     year = {2012},
     mrnumber = {2880913},
     zbl = {1249.54051},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2012__53_1_a6/}
}