http://tickertape.tdameritrade.com/options/2017/05/options-collar-limit-risk-18545

http://www.barrons.com/articles/is-this-downturn-the-end-of-the-trump-rally-1495048528

http://www.dailymail.co.uk/wires/reuters/article-4518182/Regulators-ask-Deutsche-Bank-Brexit-trading-rethink–source.html

http://www.leaprate.com/financial-services/exchanges/cboe-holdings-c2-options-exchange-sets-daily-volume-record/

http://www.marketwatch.com/story/investors-betting-on-wall-street-calm-are-get-pummeled-as-stock-market-sells-off-2017-05-17

http://www.reuters.com/article/us-usa-stocks-idUSKCN18D1E0

http://www.barrons.com/articles/look-out-dow-drops-more-than-200-points-vix-spikes-21-1495033391

http://www.bloomberg.com/view/articles/2017-05-17/worries-volatility-and-activism

http://www.marketwatch.com/story/wall-streets-fear-gauge-on-track-for-biggest-jump-in-more-than-3-months-2017-05-17

http://seekingalpha.com/article/4073965-happens-volatility-rises

http://www.investing.com/analysis/opening-bell:-risk-on-returns-to-markets,-safe-havens-rise-200189641