@article{JRAM_1923__152_149511,
     author = {K. Schwering},
     title = {Die {Siebenteilung} der lemniskatischen {Funktion} sin am (u).},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {40--48},
     publisher = {mathdoc},
     volume = {152},
     year = {1923},
     zbl = {48.1245.02},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1923__152_149511/}
}