http://www.reuters.com/article/us-usa-stocks-weekahead-idUSKCN0Z325U

http://www.investing.com/analysis/options-traders-bet-big-on-apple-200136368

http://blogs.wsj.com/moneybeat/2016/06/17/expect-big-volume-with-todays-quad-witching-newsletter-draft/

http://blogs.wsj.com/moneybeat/2016/06/17/another-brexit-headache-margin-calls-and-contract-uncertainty/

http://finance.yahoo.com/news/3-reasons-why-the-brexit-vote-is-just-not-a-big-deal-114054797.html

http://marketsmedia.com/equity-market-braces-june-24-brexit1/

http://www.reuters.com/article/us-cftc-algorithmic-idUSKCN0Z22PW

http://tradinggods.net/trading-gods-blog/us-stocks-snap-5-day-skid-volatile-session/

http://www.streetinsider.com/Hedge+Funds/Hedge+fund+industry+shrinks+in+first+quarter-HFR+data/11749397.html

http://www.bloomberg.com/news/articles/2016-06-17/vix-volume-explodes-in-notes-as-5-days-of-stress-sets-etn-record

http://tradinggods.net/trading-gods-blog/vix-daily-update-volatility-peels-back-4-month-highs/

http://tickertape.tdameritrade.com/options/2016/06/volatility-update-double-calendar-84092