http://uk.reuters.com/article/2014/02/21/usa-sec-highspeedtrading-idUKL2N0LQ22D20140221

http://www.chicagobusiness.com/article/20140221/NEWS01/140229959/cboe-to-exit-stock-exchange-business#

http://www.tradersmagazine.com/news/commentary-volatility-is-back-112129-1.html

http://www.tradersmagazine.com/news/nyse-joins-funds-seeking-to-end-maker-taker-trading-rebates-112130-1.html

http://www.wallstreetsectorselector.com/2014/02/socrates-another-famous-greek/

http://dealbook.nytimes.com/2014/02/20/with-ban-on-ads-lifted-hedge-funds-test-waters/?_php=true&_type=blogs&_php=true&_type=blogs&_r=1

http://www.reuters.com/article/2014/02/20/sec-cuban-highspeedtrading-idUSL2N0LP2J120140220?type=companyNews&feedType=RSS&feedName=companyNews

http://www.reuters.com/article/2014/02/20/us-usa-fed-yellen-idUSBREA1J1J820140220

http://online.wsj.com/news/articles/SB10001424052702304275304579395601716404662?mod=dist_smartbrief

http://uk.reuters.com/article/2014/02/20/businesswire-highfrequency-idUKL2N0LP2S720140220

http://blogs.wsj.com/moneybeat/2014/02/20/bullish-options-activity-on-facebook-surges-after-deal/

https://theoptionsinsider.com/education/?p=100031330&qcABC=1