@article{MZ_1957__67_169666,
     author = {Rudolf Steuerwald},
     title = {\"Uber die {Perioden} regelm\"a{\ss}iger {Kettenbr\"uche} f\"ur {Quadratwurzeln} aus ganzen {Zahlen.} {II.}},
     journal = {Mathematische Zeitschrift},
     pages = {181--187},
     publisher = {mathdoc},
     volume = {67},
     year = {1957},
     zbl = {0079.27501},
     url = {http://geodesic.mathdoc.fr/item/MZ_1957__67_169666/}
}