@article{10_14708_cm_v10i2_5587,
     author = {W. Waliszewski},
     title = {On closures of sets in quasi-algebras},
     journal = {Commentationes Mathematicae},
     pages = { 141--143},
     publisher = {mathdoc},
     volume = {10},
     number = {2},
     year = {1967},
     doi = {10.14708/cm.v10i2.5587},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v10i2.5587/}
}