http://www.tradersmagazine.com/news/ecns_and_exchanges/nyse-launches-new-bitcoin-index-113883-1.html

http://www.automatedtrader.net/headlines/153811/gdtrm15-latest-on-derivatives-markets-risk-and-regulation

http://www.bloomberg.com/news/articles/2015-05-19/yellen-says-regulators-ready-to-act-as-panel-cites-market-risks

http://www.cnbc.com/id/102690893

http://blogs.wsj.com/moneybeat/2015/05/19/investors-turn-to-gold-etf-options-as-hedges/

http://www.bloomberg.com/news/articles/2015-05-18/hedge-funds-trim-bullish-nasdaq-bets-as-cost-of-protection-soars-i9uhvjfl

http://www.bloomberg.com/news/articles/2015-05-19/u-s-index-futures-mirror-boom-in-europe-with-s-p-500-at-record

http://ht.ly/2YOKvZ

http://www.interactivebrokers.com/en/?f=5599&vid=6224&ns=T

http://www.marketwatch.com/story/markets-are-jumpy-over-coming-leap-second-2015-05-18-22103292

http://finance.yahoo.com/news/hedge-funds-beating-p-500-200240661.html

http://uk.reuters.com/article/2015/05/18/gpw-usa-idUKL1N0Y920R20150518