@article{MAN_1979__246_163338,
     author = {Gerhard Rosenberger},
     title = {\"Uber {Tschebyscheff-Polynome,} {Nicht-Kongruenzuntergruppen} der {Modulgruppe} und {Fibonacci-Zahlen.}},
     journal = {Mathematische Annalen},
     pages = {193--204},
     publisher = {mathdoc},
     volume = {246},
     year = {1979},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MAN_1979__246_163338/}
}