@article{MZ_1964__86_170331,
     author = {Leon Bernstein},
     title = {Periodische {Kettenbr\"uche} beliebiger {Periodenl\"ange.}},
     journal = {Mathematische Zeitschrift},
     pages = {128--135},
     publisher = {mathdoc},
     volume = {86},
     year = {1964},
     zbl = {0128.04803},
     url = {http://geodesic.mathdoc.fr/item/MZ_1964__86_170331/}
}