@article{CMUC_2007__48_4_a5,
     author = {Gonz\'alez-Hern\'andez, Juan and Hern\'andez-Hern\'andez, Fernando and Villarreal, C\'esar E.},
     title = {When is $\Bbb R$ the union of an increasing family of null sets?},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {623--630},
     publisher = {mathdoc},
     volume = {48},
     number = {4},
     year = {2007},
     mrnumber = {2375163},
     zbl = {1199.28003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2007__48_4_a5/}
}