http://seekingalpha.com/article/2223903-volatility-breakout

http://www.bloomberg.com/news/2014-05-16/what-a-4-million-error-says-about-market-anxiety-opening-line.html

http://dealbook.nytimes.com/2014/05/16/wall-street-washes-traders-mouths-with-soap/?smid=tw-dealbook&seid=auto

http://www.thetradenews.com/news/Regions/Americas/Cross_border_and_HFT_issues_to_be_tackled_by_CFTC.aspx

http://www.reuters.com/article/2014/05/16/us-markets-stocks-idUSBREA460FR20140516

http://www.fow.com/3342983/US-options-markets-lose-share.html

http://www.tradersmagazine.com/news/regulation/high-speed-trading-firms-should-register-ex-cftc-economist-says-112465-1.html

http://www.businessweek.com/news/2014-05-16/selloff-spreads-to-s-and-p-500-as-stocks-fall-most-in-month-options

http://www.reuters.com/article/2014/05/15/schwab-ceo-proposal-idUSL1N0O12EC20140515?type=companyNews&feedType=RSS&feedName=companyNews

http://blogs.barrons.com/focusonfunds/2014/05/15/russell-2000-bounces-out-of-correction-territory/

http://www.chicagotribune.com/business/sns-rt-us-banks-commodities-derivatives-analysis-20140515,0,6447716.story

http://blogs.marketwatch.com/thetell/2014/05/15/low-stock-volatility-here-to-stay-for-a-while-goldman-sachs/