@article{10_4064_cm115_1_5,
     author = {R. Drabi\'nski and E. Grzegorek},
     title = {When $\aleph _1$ many sets are contained in a
 countably generated $\sigma $-field},
     journal = {Colloquium Mathematicum},
     pages = {41--45},
     publisher = {mathdoc},
     volume = {115},
     number = {1},
     year = {2009},
     doi = {10.4064/cm115-1-5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm115-1-5/}
}