@article{MZ_1961__76_169940,
     author = {Hermann Schmidt},
     title = {\"Uber das {Additionstheorem} der zyklischen {Funktionen.}},
     journal = {Mathematische Zeitschrift},
     pages = {46--50},
     publisher = {mathdoc},
     volume = {76},
     year = {1961},
     zbl = {0095.31701},
     url = {http://geodesic.mathdoc.fr/item/MZ_1961__76_169940/}
}