<http://schema.org/url>
<http://www.businessweek.com/articles/2012-04-26/why-lower-natural-gas-prices-help-the-u-dot-s-dot-only-a-little>
<http://www.bloomberg.com/bw/articles/2012-04-26/why-lower-natural-gas-prices-help-the-u-dot-s-dot-only-a-little>