Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MAN_1903__56_158056, author = {P. Gordan}, title = {Das simultane {System} von zwei quadratischen quatern\"aren {Formen}}, journal = {Mathematische Annalen}, pages = {1--48}, publisher = {mathdoc}, volume = {56}, year = {1903}, zbl = {33.0130.02}, url = {http://geodesic.mathdoc.fr/item/MAN_1903__56_158056/} }
P. Gordan. Das simultane System von zwei quadratischen quaternären Formen. Mathematische Annalen, Tome 56 (1903), pp. 1-48. http://geodesic.mathdoc.fr/item/MAN_1903__56_158056/