http://www.cnbc.com/id/100645848

http://www.tradingfloor.com/posts/gold-options-graphical-description-price-slump-1300832684

http://www.tradersmagazine.com/news/knight-revenue-cut-in-half-in-2012-111097-1.html

http://www.forbes.com/sites/afontevecchia/2013/04/15/hedge-fund-billionaires-john-paulson-and-david-einhorn-lost-640m-in-gold-bloodbath/

http://blogs.wsj.com/marketbeat/2013/04/15/despite-gold-selloff-options-traders-bank-on-rebound/

http://www.bloomberg.com/news/2013-04-15/crude-oil-options-volatility-jumps-to-highest-since-jan-3.html

https://theoptionsinsider.com/industry/?p=100013160&qcABC=1

http://www.moneycontrol.com/news/market-cues/boston-blasts-hits-us-market-how-will-nifty-react-today_853161.html

http://www.foxbusiness.com/markets/2013/04/15/vix-fear-gauge-surges-40-following-boston-explosions/

http://www.chicagotribune.com/business/sns-rt-us-markets-precious-hedge-burbankbre93e0y0-20130415,0,1034453.story

http://blogs.barrons.com/focusonfunds/2013/04/15/what-bull-market-shares-in-vix-trackers-more-than-double/?mod=google_news_blog

http://www.bloomberg.com/news/2013-04-15/u-s-stock-options-with-biggest-changes-in-implied-volatility.html?cmpid=yhoo