http://seekingalpha.com/article/1155281-vix-options-volatility-and-market-sonar-monday-recap

http://www.bloomberg.com/news/2013-02-04/u-s-stock-options-with-biggest-changes-in-implied-volatility.html?cmpid=yhoo

https://theoptionsinsider.com/industry/?p=100008357&qcABC=1

http://www.chicagotribune.com/business/breaking/chi-cme-volume-slips-in-january-from-year-earlier-20130204,0,2713993.story

http://online.barrons.com/article/SB50001424052748704372504578283811559514082.html?mod=BOL_hpp_highlight_bottom

http://www.minyanville.com/trading-and-investing/options/articles/Are-SPX-Options-Too-Cheap-options/2/4/2013/id/47867?camp=syndication&medium=portals&from=yahoo

http://www.ifre.com/derivatives-us-options-stage-january-comeback/21066823.article

http://www.tradersmagazine.com/news/bats-modifieis-price-sliding-orders-110838-1.html

http://seekingalpha.com/article/1153991-just-how-low-can-vix-go?source=yahoo

http://www.bloomberg.com/news/2013-02-01/igt-says-former-chairman-was-awarded-backdated-stock-options.html

http://www.wallstreetandtech.com/regulatory-compliance/the-hedge-fund-transparency-challenge/240147476

http://www.advancedtrading.com/regulations/swap-dealers-go-to-washington-demand-a-l/240147646