<https://www.blackhatworld.com/seo/scaling-my-authority-site-to-20k-per-month.1405460/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://static.blackhatworld.com/seo/scaling-my-authority-site-to-20k-per-month.1405460/page-6#post-15504292>