@article{10_4064_ap_8_1_55_60,
     author = {J. Kordylewski and M. Kuczma},
     title = {On the functional equation $F(x,\ensuremath{\varphi}(x),\ensuremath{\varphi} [f_1(x)],...,\ensuremath{\varphi} [f_n(x)])=0$},
     journal = {Annales Polonici Mathematici},
     pages = {55--60},
     publisher = {mathdoc},
     volume = {8},
     number = {1},
     year = {1960},
     doi = {10.4064/ap-8-1-55-60},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-8-1-55-60/}
}