@article{MAN_1875__9_156710,
     author = {Sohncke},
     title = {Zur {Theorie} des optischen {Drehverm\"ogens} von {Krystallen}},
     journal = {Mathematische Annalen},
     pages = {504--529},
     publisher = {mathdoc},
     volume = {9},
     year = {1875},
     zbl = {08.0657.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1875__9_156710/}
}