@misc{Sylvester_James_Joseph_(1814–1897)_Sur_1909,
 author={Sylvester, James Joseph (1814–1897)},
 volume={3},
 copyright={Public Domain},
 address={Cambridge},
 howpublished={online},
 year={1909},
 publisher={Cambridge University Press},
 language={fre},
 type={Text},
 title={Sur le vrai nombre des covariants élémentaires d'un systéme de deux formes biquadratiques binaires},
 URL={http://www.rcin.org.pl/impan/Content/161687/PDF/WA35_189662_11371-3_art-8.pdf},
}