@article{CMUC_2013__54_3_a8,
     author = {Filip\'ow, Rafa{\l} and Mro\.zek, Nikodem and Rec{\l}aw, Ireneusz and Szuca, Piotr},
     title = {Extending the ideal of nowhere dense subsets of rationals to a {P-ideal}},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {429--435},
     publisher = {mathdoc},
     volume = {54},
     number = {3},
     year = {2013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2013__54_3_a8/}
}