http://www.chicagotribune.com/business/breaking/chi-cboe-holdings-ceo-brodsky-to-step-down-in-may-20121212,0,7890140.story

http://www.advancedtrading.com/managingthedesk/the-biggest-risk-on-wall-street-still-r/240144168

http://blogs.barrons.com/focusonfunds/2012/12/11/investors-paying-more-for-volatility-protection-than-ever-before/?mod=BOLBlog

http://blogs.barrons.com/focusonfunds/2012/12/11/in-investors-hedge-fund-flows-big-performers-are-still-winning/?mod=BOLBlog

http://seekingalpha.com/article/1059351-stubborn-put-option-action-continues-in-cognizant-technology

http://www.bloomberg.com/news/2012-12-11/oil-options-volatility-slips-as-crude-rises-on-german-confidence.html

http://www.minyanville.com/trading-and-investing/options/articles/mmm-3m-3m-puts-3m-calls/12/11/2012/id/46599?camp=syndication&medium=portals&from=yahoo

https://theoptionsinsider.com/tradingtechnology/?p=100004975&qcABC=1

http://online.barrons.com/article/SB50001424052748703496404578173323154582426.html?mod=BOL_hpp_highlight_bottom

http://investorplace.com/2012/12/aapl-volatility-got-ya-scared-dont-worry-profit-instead/

http://www.bloomberg.com/news/2012-12-10/nasdaq-buys-25-stake-in-dutch-derivatives-system-tom.html

http://blogs.wsj.com/ideas-market/2012/12/10/do-hedge-funds-manipulate-stock-prices/