@misc{Cayley_Arthur_(1821–1895)_On_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={On some geometrical theorems relating to a triangle circumscribed about a conic},
 type={Text},
 URL={http://www.rcin.org.pl/Content/170934/PDF/WA35_184418_12807-3_art-7.pdf},
}