@article{MAN_1875__9_156697,
     author = {Harnack},
     title = {Zur {Theorie} der tern\"aren cubischen {Formen}},
     journal = {Mathematische Annalen},
     pages = {218--240},
     publisher = {mathdoc},
     volume = {9},
     year = {1875},
     zbl = {07.0066.02},
     url = {http://geodesic.mathdoc.fr/item/MAN_1875__9_156697/}
}