@article{10_1007_s10587_012_0061_2,
     author = {Kope\v{c}ek, Old\v{r}ich},
     title = {Equation $f(p(x)) = q(f(x))$ for given real functions $p$, $q$},
     journal = {Czechoslovak Mathematical Journal},
     pages = {1011--1032},
     publisher = {mathdoc},
     volume = {62},
     number = {4},
     year = {2012},
     doi = {10.1007/s10587-012-0061-2},
     mrnumber = {3010254},
     zbl = {1274.08022},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/articles/10.1007/s10587-012-0061-2/}
}