@article{AM2_1988__36_2-3_137280,
     author = {Marek Cezary Zdun},
     title = {Note on commutable functions.},
     journal = {Aequationes mathematicae},
     pages = {153--164},
     publisher = {mathdoc},
     volume = {36},
     number = {2-3},
     year = {1988},
     zbl = {0662.39004},
     url = {http://geodesic.mathdoc.fr/item/AM2_1988__36_2-3_137280/}
}