@misc{Cayley_Arthur_(1821–1895)_A_1891,
 author={Cayley, Arthur (1821–1895)},
 volume={4},
 copyright={Public Domain},
 address={Cambridge},
 journal={Mathematical papers},
 howpublished={online},
 year={1891},
 publisher={University Press},
 language={eng},
 title={A theorem in conics},
 type={Text},
 URL={http://rcin.org.pl/Content/127866/PDF/WA35_155501_12807-4_A-theorem-in-conic.pdf},
}