<http://schema.org/mainEntityOfPage>
<http://www.upi.com/Science_News/2013/10/02/Suggestion-of-supervolcanoes-on-Mars-ignites-controversy/16381380746866/>
<http://www.upi.com/Science_News/2013/10/02/Suggestion-of-supervolcanoes-on-Mars-ignites-controversy/UPI-16381380746866/>