@misc{Cayley_Arthur_(1821–1895)_Theorem_1893,
 author={Cayley Arthur (1821–1895)},
 volume={6},
 copyright={Public Domain},
 journal={Mathematical papers},
 address={Cambridge},
 howpublished={online},
 year={1893},
 publisher={Cambridge University Press},
 language={eng},
 type={Text},
 title={Theorem relating to the four Conics which touch the same two lines and pass through the same four points},
 URL={http://www.rcin.org.pl/Content/135033/PDF/WA35_165065_12807-6_Art390.pdf},
}