@article{CMJ_2008_58_2_a18,
     author = {Bican, Ladislav},
     title = {On torsionfree classes which are not precover classes},
     journal = {Czechoslovak Mathematical Journal},
     pages = {561--568},
     year = {2008},
     volume = {58},
     number = {2},
     mrnumber = {2411109},
     zbl = {1166.16013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2008_58_2_a18/}
}