@article{10_14708_cm_v6i1_5468,
     author = {A. Rotkiewicz},
     title = {O w{\l}asno\'sciach wyra\.zenia {\cyra}{\cyrp}\ensuremath{\pm}b{\cyrp}},
     journal = {Commentationes Mathematicae},
     pages = { 1--20},
     publisher = {mathdoc},
     volume = {6},
     number = {1},
     year = {1961},
     doi = {10.14708/cm.v6i1.5468},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v6i1.5468/}
}