@article{10_4064_ap_37_1_25_47,
     author = {Z. Kare\'nska},
     title = {On a system of functional equations occurring in the theory of geometric objects},
     journal = {Annales Polonici Mathematici},
     pages = {25--47},
     publisher = {mathdoc},
     volume = {37},
     number = {1},
     year = {1980},
     doi = {10.4064/ap-37-1-25-47},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-37-1-25-47/}
}