From Martin Gardner, The Universe in a Handkerchief (1996), ISBN 0-387-94673-X, p.20.--Longfellow (talk) 13:17, 4 October 2010 (UTC)
From Martin Gardner, The Universe in a Handkerchief (1996), ISBN 0-387-94673-X, p.20.--Longfellow (talk) 13:17, 4 October 2010 (UTC)Reply