http://www.bloomberg.com/news/articles/2015-06-28/with-61-seconds-in-a-minute-markets-brace-for-trouble

http://www.marketwatch.com/story/why-the-cme-group-delayed-the-closing-of-pits-2015-06-24

http://www.thetradenews.com/News/Operations___Technology/Trading_tools/Complex_US_options_market_hampers_liquidity_-_report.aspx

http://www.reuters.com/article/2015/06/24/cme-landmark-options-idUSL3N0Z84DT20150624

http://www.marketwatch.com/story/us-stocks-set-for-sharp-losses-with-greece-on-brink-of-default-2015-06-29?siteid=yhoof2

http://online.barrons.com/articles/what-if-greece-defaults-1435377110

http://www.reuters.com/article/2015/06/26/us-gold-china-sge-idUSKBN0P610220150626

http://www.cboeoptionshub.com/2015/06/27/vix/

http://www.bloomberg.com/news/articles/2015-06-29/india-vix-jumps-most-in-3-months-on-greece-as-tata-options-climb

http://www.bloomberg.com/news/articles/2015-06-28/oil-drops-a-4th-day-as-greece-closing-banks-amid-bailout-expiry

http://www.bloomberg.com/news/articles/2015-06-29/playing-catch-up-in-u-s-small-caps-as-inflows-hit-six-year-high