@article{10_4064_ap_9_3_275_284,
     author = {M. Kuczma},
     title = {General solution of the functional equation {\ensuremath{\varphi}[f(x)]=G(x,\ensuremath{\varphi}(x))}},
     journal = {Annales Polonici Mathematici},
     pages = {275--284},
     publisher = {mathdoc},
     volume = {9},
     number = {3},
     year = {1960},
     doi = {10.4064/ap-9-3-275-284},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-9-3-275-284/}
}