[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, 版)) <http://www.metatags.org/meta_name_distribution>
[2] WWW-Talk Apr-Jun 1994: <meta information> ( 版) <http://1997.webhistory.org/www.lists/www-talk.1994q2/0744.html>