@article{10_4064_ap_9_3_285_293,
     author = {J. Kordylewski},
     title = {On the functional equation $F(x,\ensuremath{\varphi}(x), \ensuremath{\varphi}[f(x)],\ensuremath{\varphi}[f^2 (x)],...,\ensuremath{\varphi}[f^n(x)])=0$},
     journal = {Annales Polonici Mathematici},
     pages = {285--293},
     publisher = {mathdoc},
     volume = {9},
     number = {3},
     year = {1960},
     doi = {10.4064/ap-9-3-285-293},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-9-3-285-293/}
}