@misc{Cayley_Arthur_(1821–1895)_On_1891, author={Cayley, Arthur (1821–1895)}, volume={4}, copyright={Public Domain}, address={Cambridge}, journal={Mathematical papers}, howpublished={online}, year={1891}, publisher={University Press}, language={eng}, title={On some formulae relating to the distances of a point from the vertices of a triangle, and to the problem of tractions}, type={Text}, URL={http://rcin.org.pl/Content/127872/PDF/WA35_155519_12807-4_On-some-formulae.pdf}, }