@misc{Cayley_Arthur_(1821–1895)_On_1897, author={Cayley Arthur (1821–1895)}, copyright={Public Domain}, address={Cambridge}, journal={Mathematical papers}, howpublished={online}, year={1897}, publisher={Cambridge University Press}, language={eng}, title={On systems of rays}, type={Text}, URL={http://rcin.org.pl/Content/125413/PDF/WA35_154348_12807-12_Art78.pdf}, }