http://www.reuters.com/article/2013/04/02/derivatives-regulation-idUSL2N0CP0KA20130402

http://www.thetradenews.com/news/Regions/Americas/US_FCMs_to_reduce_by_a_third_in_six_years_by_end-2013_%E2%80%93_TABB.aspx

http://www.prnewswire.com/news-releases/cboe-holdings-reports-march-2013-trading-volume-200928661.html

http://www.bloomberg.com/news/2013-04-01/embargo-till-4pm-us-est.html

http://www.tradersmagazine.com/news/fx-notebook-clearing-service-for-regulated-transactions-111054-1.html

http://www.bloomberg.com/news/2013-04-01/oil-options-volatility-rises-as-futures-fall-on-pipe-shutdown.html?cmpid=yhoo

http://seekingalpha.com/article/1312671-vix-options-volatility-and-market-sonar-monday-recap?source=yahoo

http://blogs.barrons.com/focusonfunds/2013/04/01/low-volatility-index-part-of-it-just-reflects-small-stock-swings/?mod=yahoobarrons

http://online.barrons.com/article/SB50001424052748703769504578396400215337898.html?ru=yahoo&mod=yahoobarrons

http://www.marketwatch.com/story/how-gold-etfs-have-transformed-market-in-10-years-2013-03-29?dist=etfs

https://theoptionsinsider.com/tradingtechnology/?p=100012207&qcABC=1

http://www.bloomberg.com/news/2013-04-01/u-s-stock-options-with-biggest-changes-in-implied-volatility.html?cmpid=yhoo