@article{JRAM_1974__265_151410,
     author = {E. Heppner},
     title = {\"Uber die {Iteration} von {Teilerfunktionen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {176--182},
     publisher = {mathdoc},
     volume = {265},
     year = {1974},
     zbl = {0273.10037},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1974__265_151410/}
}