@misc{Cayley_Arthur_(1821–1895)_Note_1897,
 author={Cayley Arthur (1821–1895)},
 copyright={Public Domain},
 address={Cambridge},
 journal={Mathematical papers},
 howpublished={online},
 year={1897},
 publisher={Cambridge University Press},
 language={eng},
 type={Text},
 title={Note on the differential equation dx/√(1-x²) + dy/√(1-y²)=0},
 URL={http://www.rcin.org.pl/Content/125417/PDF/WA35_154352_12807-12_Art81.pdf},
}