@article{CMUC_2006__47_3_a15,
     author = {Zdomskyy, Lyubomyr},
     title = {A semifilter approach to selection principles {II:} $\tau^\ast$-covers},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {539--547},
     publisher = {mathdoc},
     volume = {47},
     number = {3},
     year = {2006},
     mrnumber = {2281015},
     zbl = {1150.03016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2006__47_3_a15/}
}