@article{MZ_1960__73_169834,
     author = {Wendelin Degen},
     title = {\"Uber geschlossene {Laplace-Ketten} ungerader {Periodenzahl.}},
     journal = {Mathematische Zeitschrift},
     pages = {95--120},
     year = {1960},
     volume = {73},
     zbl = {0101.39504},
     url = {http://geodesic.mathdoc.fr/item/MZ_1960__73_169834/}
}