@article{AM2_1971__7_136246,
     author = {J. GER and A. SMAJDOR},
     title = {Regular {Iteration} in the {Case} of {Multiplier} {Zero}},
     journal = {Aequationes mathematicae},
     pages = {127--131},
     publisher = {mathdoc},
     volume = {7},
     year = {1971},
     zbl = {0243.39006},
     url = {http://geodesic.mathdoc.fr/item/AM2_1971__7_136246/}
}