@article{MZ_1931__33_168293,
     author = {H., Schmidt},
     title = {\"Uber die komplement\"are {Klasse} bei den hypozykloidischen {Funktionssystemen}},
     journal = {Mathematische Zeitschrift},
     pages = {714--732},
     publisher = {mathdoc},
     volume = {33},
     year = {1931},
     zbl = {0002.13802},
     url = {http://geodesic.mathdoc.fr/item/MZ_1931__33_168293/}
}