@article{10_14708_cm_v21i1_5956,
     author = {A. Abian},
     title = {k-inductive {Boolean} algebras and the existence of special ultrafilters},
     journal = {Commentationes Mathematicae},
     pages = { 1--3},
     publisher = {mathdoc},
     volume = {21},
     number = {1},
     year = {1980},
     doi = {10.14708/cm.v21i1.5956},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v21i1.5956/}
}