@article{MZ_1950__52_169149,
     author = {R. STEUERWALD},
     title = {\"Uber die {Perioden} regelm\"a{\ss}iger {Kettenbr\"uche} f\"ur {Quadratwurzeln} aus ganzen {Zahlen}},
     journal = {Mathematische Zeitschrift},
     pages = {686--697},
     publisher = {mathdoc},
     volume = {52},
     year = {1950},
     zbl = {0037.03101},
     url = {http://geodesic.mathdoc.fr/item/MZ_1950__52_169149/}
}