http://www.futuresmag.com/2014/04/25/are-exchanges-and-brokerage-houses-the-new-deep-po?t=regulations

http://blogs.barrons.com/focusonfunds/2014/04/25/vanguards-bogle-its-better-to-have-high-frequency-trading-than-not/?mod=BOLBlog

http://www.businessweek.com/news/2014-04-25/traders-bet-silver-streak-ending-with-gold-on-inflation-options

http://www.minyanville.com/trading-and-investing/options/articles/vxst-volatility-index-cboe-options-trading/4/25/2014/id/54723

http://www.cboeoptionshub.com/2014/04/24/sell-may-go-away-alternatives-part-3-put/

http://in.reuters.com/article/2014/04/24/nasdaq-omx-results-idINL2N0NG0H520140424

http://www.ftseglobalmarkets.com/news/cme-europe-set-for-launch.html

http://www.nasdaq.com/article/3-foolproof-solutions-for-options-mistakes-know-your-options-cm347101

http://www.bloomberg.com/news/2014-04-25/backbone-of-u-s-stock-trading-said-poised-for-upgrade.html

https://theoptionsinsider.com/tradingtechnology/?p=100034323&qcABC=1

http://uk.reuters.com/article/2014/04/24/nasdaq-omx-investigation-idUKL2N0NG10K20140424

http://www.investopedia.com/articles/active-trading/042414/what-makertaker-fees-mean-you.asp