@article{MZ_1970__115_171330,
     author = {Arne Magnus and Michael Mandell},
     title = {On {Convergence} of {Sequences} of {Linear} {Fractional} {Transformations.}},
     journal = {Mathematische Zeitschrift},
     pages = {11--17},
     publisher = {mathdoc},
     volume = {115},
     year = {1970},
     zbl = {0189.36803},
     url = {http://geodesic.mathdoc.fr/item/MZ_1970__115_171330/}
}