@misc{Cayley_Arthur_(1821–1895)_Theorem_1896,
 author={Cayley Arthur (1821–1895)},
 volume={9},
 copyright={Public Domain},
 address={Cambridge},
 journal={The collected mathematical papers of Arthur Cayley},
 howpublished={online},
 year={1896},
 publisher={Cambridge University Press},
 language={eng},
 title={Theorem in regard to the Hessian of a quaternary function},
 type={Text},
 URL={http://rcin.org.pl/Content/120601/PDF/WA35_150338_12807-9_572.pdf},
}