@article{10_14708_cm_v17i2_5779,
     author = {S. Czerwik},
     title = {Solutions of class {\(C^r\)} with respect to the parameter of a linear functional equation},
     journal = {Commentationes Mathematicae},
     pages = { 341--345},
     publisher = {mathdoc},
     volume = {17},
     number = {2},
     year = {1974},
     doi = {10.14708/cm.v17i2.5779},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v17i2.5779/}
}