@misc{Cayley_Arthur_(1821–1895)_On_1893,
 author={Cayley Arthur (1821–1895)},
 volume={6},
 copyright={Public Domain},
 address={Cambridge},
 journal={Mathematical papers},
 howpublished={online},
 year={1893},
 publisher={Cambridge University Press},
 language={eng},
 title={On a certain Envelope depending on a Triangle inscribed in a Circle},
 type={Text},
 URL={http://www.rcin.org.pl/Content/135048/PDF/WA35_165157_12807-6_Art396.pdf},
}