http://fortune.com/2015/03/23/the-witching-hour-how-the-algos-took-apple-down-at-fridays-close/

http://www.bloomberg.com/news/articles/2015-03-23/paying-most-since-08-on-dollar-hedges-works-as-currency-plunges

http://www.businessinsider.com/r-senator-warren-questions-sec-chair-on-broker-reforms-2015-3

http://www.wsj.com/articles/alleged-spoofing-trader-faces-new-accusations-1427065319?mod=WSJ_hps_sections_markets

http://finance.yahoo.com/news/stock-futures-dip-strong-gains-114500176.html

http://blogs.wsj.com/moneybeat/2015/03/20/volcker-outlines-plan-for-overhauling-financial-regulation/

http://www.wallstreetsectorselector.com/investment-articles/wall-street-sector-selector-market-update-and-analysis/2015/03/quadruple-witching-trims-fridays-gains/

http://www.investing.com/analysis/update-of-the-spx:vix-ratio-245840

http://www.bloomberg.com/news/articles/2015-03-20/cme-is-said-to-mull-rule-change-as-basel-pressure-hampers-banks

http://www.tradersmagazine.com/news/buyside/real-time-risk-can-predict-a-next-flash-crash-113612-1.html

http://blogs.barrons.com/focusonfunds/2015/03/20/whopper-options-bet-against-vix-etf/

http://www.foxbusiness.com/markets/2015/03/20/wall-street-looks-to-rebound-after-oil-driven-losses/