@misc{Cayley_Arthur_(1821–1895)_Note_1891,
 author={Cayley, Arthur (1821–1895)},
 volume={4},
 copyright={Public Domain},
 address={Cambridge},
 journal={Mathematical papers},
 howpublished={online},
 year={1891},
 publisher={University Press},
 language={fre},
 type={Text},
 title={Note sur les normales d'une conique},
 URL={http://www.rcin.org.pl/impan/Content/124734/PDF/WA35_152739_12807-4_Note-sur-les.pdf},
}