<http://schema.org/url>
<http://www.businessweek.com/articles/2013-04-11/how-to-convert-the-country-to-natural-gas-by-t-dot-boone-pickens>
<http://www.businessweek.com/printer/articles/109060-how-to-convert-the-country-to-natural-gas-by-t-dot-boone-pickens>