@misc{Cayley_Arthur_(1821–1895)_Extract_1895, author={Cayley, Arthur (1821–1895)}, copyright={Public Domain}, address={Cambridge}, journal={Mathematical papers}, howpublished={online}, year={1895}, publisher={Cambridge University Press}, language={eng}, type={Text}, title={Extract from a letter from Prof. Cayley to Mr. C. W. Merrifield}, URL={http://rcin.org.pl./Content/135365/PDF/WA35_168119_12807-8_Art53.pdf}, }