@article{AULFM_1992_05_a7,
     author = {Balcerzak, Marek},
     title = {Orthogonal \ensuremath{\sigma}-ideals and almost disjoint families},
     journal = {Acta Universitatis Lodziensis. Folia Mathematica},
     publisher = {mathdoc},
     volume = {05},
     year = {1992},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AULFM_1992_05_a7/}
}