@misc{Cayley_Arthur_(1821–1895)_A_1889,
 author={Cayley Arthur (1821–1895)},
 copyright={Public Domain},
 journal={Mathematical papers},
 address={Cambridge},
 howpublished={online},
 year={1889},
 publisher={Cambridge University Press},
 language={eng},
 type={Text},
 title={A Memoir on Caustics},
 URL={http://www.rcin.org.pl/Content/122093/PDF/WA35_149309_12807-2_Art45.pdf},
}