@misc{Cayley_Arthur_(1821–1895)_Two_1890,
 author={Cayley, Arthur (1821–1895)},
 volume={3},
 copyright={Public Domain},
 address={Cambridge},
 journal={Mathematical papers},
 howpublished={online},
 year={1890},
 publisher={Cambridge at the University Press},
 language={eng},
 title={Two letters on cubic forms},
 type={Text},
 URL={http://rcin.org.pl/Content/170870/PDF/WA35_184412_12807-3_art-4.pdf},
}