http://www.bloomberg.com/news/articles/2015-08-21/s-p-500-futures-little-changed-after-stock-rout-erased-2015-gain

http://www.marketwatch.com/story/vix-fear-index-sees-biggest-weekly-jump-ever-2015-08-21

http://blogs.barrons.com/focusonfunds/2015/08/21/some-fear-gauge-the-vix-never-saw-that-one-coming/

http://www.wsj.com/articles/hedge-fund-gains-100-million-in-two-days-on-bearish-china-bet-1440136499

http://www.etftrends.com/2015/08/surprising-jump-in-volatility-in-a-normally-docile-sector/

http://www.bloomberg.com/news/articles/2015-08-21/india-vix-poised-for-two-month-high-amid-global-equities-rout

http://www.bloomberg.com/news/articles/2015-08-20/bulls-against-wall-in-s-p-500-as-seven-month-trading-range-caves

http://www.straitstimes.com/business/companies-markets/global-markets-in-uncharted-waters-as-us-stocks-show-cracks

http://www.chicagotribune.com/news/sns-wp-blm-news-bc-markets20-20150820-story.html

http://www.bloomberg.com/news/articles/2015-08-21/global-markets-in-uncharted-waters-as-u-s-stocks-show-cracks

http://www.reuters.com/article/2015/08/19/us-merrill-finra-idUSKCN0QO21G20150819

http://www.bloomberg.com/news/videos/2015-08-20/why-options-traders-are-getting-more-bearish