@misc{Cayley_Arthur_(1821–1895)_On_1891, author={Cayley, Arthur (1821–1895)}, volume={4}, copyright={Domena Publiczna}, journal={Mathematical papers}, address={Cambridge}, howpublished={online}, year={1891}, publisher={University Press}, language={eng}, type={Tekst}, title={On the Porism of the in-and-circumscribed polygon}, URL={http://rcin.org.pl./Content/125718/PDF/WA35_155278_12807-4_On-the-Porism.pdf}, }