@article{10_14708_cm_v12i2_5141,
     author = {Z. {\CYRK}are\'nska},
     title = {On some functional equation in the theory of geometric objects},
     journal = {Commentationes Mathematicae},
     pages = { 219--226},
     year = {1969},
     volume = {12},
     number = {2},
     doi = {10.14708/cm.v12i2.5141},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v12i2.5141/}
}