This result agrees with Herbert Edwin Hawkes; William Arthur Luby; Frank Charles Touton. Exercise 175. Plane geometry. Ginn & Co. 1920: 302 [2016-08-28]. (原始内容存档于2014-01-01).
This result agrees with Herbert Edwin Hawkes; William Arthur Luby; Frank Charles Touton. Exercise 175. Plane geometry. Ginn & Co. 1920: 302 [2016-08-28]. (原始内容存档于2014-01-01).
Kaleidoscopes: Selected Writings of H.S.M. Coxeter, edited by F. Arthur Sherk, Peter McMullen, Anthony C. Thompson, Asia Ivic Weiss, Wiley-Interscience Publication, 1995, ISBN 978-0-471-01003-6[1] (页面存档备份,存于互联网档案馆)
Kaleidoscopes: Selected Writings of H.S.M. Coxeter, edited by F. Arthur Sherk, Peter McMullen, Anthony C. Thompson, Asia Ivic Weiss, Wiley-Interscience Publication, 1995, ISBN 978-0-471-01003-6[1] (页面存档备份,存于互联网档案馆)
wolfram.com
mathworld.wolfram.com
Herbert W Richmond. Pentagon. 1893 [2016-08-28]. (原始内容存档于2020-11-27).