@misc{Cayley_Arthur_(1821–1895)_Addition_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={Addition to Mr Walton's paper "On the ray-planes in biaxal crystals"},
 URL={http://www.rcin.org.pl/impan/Content/120606/PDF/WA35_150346_12807-9_576.pdf},
}