@article{AM2_1988__35_2-3_137251,
     author = {Gerd M\"uller},
     title = {Remarks on iteration of formal automorphisms.},
     journal = {Aequationes mathematicae},
     pages = {17--22},
     publisher = {mathdoc},
     volume = {35},
     number = {2-3},
     year = {1988},
     zbl = {0661.13007},
     url = {http://geodesic.mathdoc.fr/item/AM2_1988__35_2-3_137251/}
}