http://www.reuters.com/article/2015/08/03/china-stocks-regulator-citadel-idUSL3N10E0J720150803

http://uk.finance.yahoo.com/news/morning-moneybeat-europe-greek-stocks-085000940.html

http://www.bloomberg.com/news/articles/2015-07-31/u-s-brokers-face-big-rise-in-exchange-fees-thanks-to-sec-ruling

http://www.reuters.com/article/2015/07/31/markets-usa-options-idUSL3N10A6FX20150731

http://www.reuters.com/article/2015/07/31/cboe-results-idUSL1N10B19420150731

http://www.tradersmagazine.com/news/buyside/td-ameritrade-creates-trading-tool-based-on-traders-market-perception-114213-1.html

http://www.cnbc.com/2015/07/31/traders-bet-on-another-plunge-for-apple.html

http://www.resourceinvestor.com/2015/07/30/us-steel-rally-draws-bullish-option-plays

http://www.reuters.com/article/2015/07/30/us-bats-exchanges-manipulation-curbs-idUSKCN0Q41WP20150730

http://www.reuters.com/article/2015/07/31/us-china-stocks-csrc-idUSKCN0Q505J20150731

http://www.bloomberg.com/news/articles/2015-07-31/india-s-vix-index-heads-for-steepest-monthly-decline-since-march

http://www.mondovisione.com/media-and-resources/news/cboe-to-list-vix-weeklys-options-beginning-october-8/