@article{AM2_1985__28_137047,
     author = {R.C. Mullin},
     title = {A remark on generalized iterates.},
     journal = {Aequationes mathematicae},
     pages = {124--128},
     publisher = {mathdoc},
     volume = {28},
     year = {1985},
     zbl = {0559.39004},
     url = {http://geodesic.mathdoc.fr/item/AM2_1985__28_137047/}
}