@misc{Cayley_Arthur_(1821–1895)_On_1897,
 author={Cayley, Arthur (1821–1895)},
 volume={13},
 copyright={Domena Publiczna},
 address={Cambridge},
 journal={Mathematical papers},
 howpublished={online},
 year={1897},
 publisher={Cambridge University Press},
 language={eng},
 type={Tekst},
 title={On the nine-points circle of a spherical triangle},
 URL={http://www.rcin.org.pl/impan/Content/149116/PDF/WA35_181651_12807-13_Art964.pdf},
}