[1] How to use <meta name="distribution" content="option"> the meaning of the meta name distribution | meta tags search engine promotion ( (the Metatags Company Inc. - seo services 著, 2012-01-21 15:17:54 +09:00 版)) http://www.metatags.org/meta_name_distribution

[2] WWW-Talk Apr-Jun 1994: <meta information> (2015-01-25 12:53:55 +09:00 版) http://1997.webhistory.org/www.lists/www-talk.1994q2/0744.html