http://www.bloomberg.com/news/articles/2016-05-31/one-minute-plunge-sends-chinese-stock-futures-down-by-10-limit

http://tradinggods.net/trading-gods-blog/vix-daily-update-3/

http://www.cabot.net/editors/jacob-mintz/analysts-center/options-market-update-5-31-16

http://www.investors.com/research/options/pound-drops-on-new-brexit-poll-options-indicate-volatility/

http://www.thetradenews.com/Asset-Classes/Derivatives/CME-clearing-house-approved-by-Singapore-regulators/

http://www.cboeoptionshub.com/2016/05/29/weekend-review-volatility-indexes-etps-523-527/

http://tradinggods.net/trading-gods-blog/sp-500-faces-die-moment/

http://uk.reuters.com/article/deutsche-boerse-lse-idUKL8N18S2EP

http://www.barrons.com/articles/hedge-funds-bedeviled-by-weak-performance-1464409077

http://www.bloomberg.com/news/articles/2016-05-31/u-s-index-futures-are-little-changed-as-focus-returns-to-data

http://www.investing.com/analysis/do-the-cpce-and-vix-suggest-a-top-is-imminent-200132940

http://www.investing.com/analysis/markets-are-getting-that-overbought-look-again-200132792