@article{CMUC_2003__44_3_a11,
     author = {Zaj{\'\i}\v{c}ek, Lud\v{e}k and Zelen\'y, Miroslav},
     title = {On the complexity of some $\sigma$-ideals of $\sigma${-P-porous} sets},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {531--554},
     publisher = {mathdoc},
     volume = {44},
     number = {3},
     year = {2003},
     mrnumber = {2025819},
     zbl = {1099.54029},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2003__44_3_a11/}
}