@article{AFM_1984_9_1_a6,
     author = {Lars V. Ahlfors},
     title = {Old and new in {M\"obius} groups},
     journal = {Annales Fennici Mathematici},
     pages = {93--105},
     year = {1984},
     volume = {9},
     number = {1},
     doi = {10.5186/aasfm.1984.0901},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1984.0901/}
}