@article{10_4064_ap_14_1_59_67,
     author = {M. Kucharzewski and M. Kuczma},
     title = {On a system of functional equations occurring in the theory of geometric objects},
     journal = {Annales Polonici Mathematici},
     pages = {59--67},
     publisher = {mathdoc},
     volume = {14},
     number = {1},
     year = {1963},
     doi = {10.4064/ap-14-1-59-67},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-14-1-59-67/}
}