@article{10_4064_ap_7_1_21_32,
     author = {J. Kordylewski and M. Kuczma},
     title = {On the functional equation {F(x,\ensuremath{\varphi}(x),\ensuremath{\varphi}[f(x)])=0}},
     journal = {Annales Polonici Mathematici},
     pages = {21--32},
     publisher = {mathdoc},
     volume = {7},
     number = {1},
     year = {1959},
     doi = {10.4064/ap-7-1-21-32},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-7-1-21-32/}
}