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@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/} }
Harnack. Zur Theorie der ternären cubischen Formen. Mathematische Annalen, Tome 9 (1875), pp. 218-240. http://geodesic.mathdoc.fr/item/MAN_1875__9_156697/