@misc{Cayley_Arthur_(1821–1895)_A_1896,
 author={Cayley Arthur (1821–1895)},
 volume={9},
 copyright={Public Domain},
 address={Cambridge},
 journal={The collected mathematical papers of Arthur Cayley},
 howpublished={online},
 year={1896},
 publisher={Cambridge University Press},
 language={eng},
 type={Text},
 title={A demonstration of Dupin's theorem},
 URL={http://www.rcin.org.pl/Content/120599/PDF/WA35_150337_12807-9_571.pdf},
}