@misc{Campbell_John_Edward_(1862–1924)_On_1893-1894, author={Campbell, John Edward (1862–1924)}, volume={XXIII}, editor={Glaisher, James Whitbread Lee (1848–1928)}, copyright={Public Domain}, journal={The Messenger of Mathematics}, address={London ;}, address={Cambridge}, howpublished={online}, year={1893-1894}, publisher={Macmillan and Co.}, language={eng}, language={eng}, title={On the shortest path consisting of straight lines between two points on a ruled quadric}, type={Text}, URL={http://www.rcin.org.pl/Content/110486/PDF/WA35_88040_cz294-1894-t23_Art33.pdf}, }