http://dealbook.nytimes.com/2014/05/22/turf-wars-seen-in-response-to-high-frequency-trading/

http://www.reuters.com/article/2014/05/21/us-sec-brokerages-investigation-idUSBREA4K15S20140521

http://blogs.wsj.com/moneybeat/2014/05/21/vix-closes-below-12-is-that-bullish/

http://blogs.wsj.com/moneybeat/2014/05/21/now-theres-a-novel-about-high-frequency-trading/?mod=WSJBlog

http://www.bloomberg.com/news/2014-05-22/bed-bath-beyond-shares-on-sale-rack-after-24-plunge-options.html

http://www.newsweek.com/2014/05/30/wall-street-pulling-fast-one-251784.html

https://theoptionsinsider.com/industry/?p=100035625&qcABC=1

http://www.benzinga.com/news/14/05/4574745/andrew-giovinazzi-of-option-pit-talks-options-strategies

http://investorplace.com/2014/05/sp-500-boring-market/

http://www.reuters.com/article/2014/05/21/cme-outages-pits-idUSL1N0O72M120140521

http://www.chicagobusiness.com/article/20140521/BLOGS03/140529950/flash-boys-author-michael-lewis-keeps-chicago-visit-under-wraps

http://www.bloomberg.com/news/2014-05-21/trader-spends-13-million-to-bet-vix-will-jump-56-by-september.html