@article{ARM_1973_9_1_a4,
     author = {Karpe, Robert},
     title = {Verallgemeinerung der goniometrischen {Funktionen}},
     journal = {Archivum mathematicum},
     pages = {26--48},
     year = {1973},
     volume = {9},
     number = {1},
     mrnumber = {0362007},
     zbl = {0282.50004},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/ARM_1973_9_1_a4/}
}