http://www.businessweek.com/news/2013-04-22/vix-has-biggest-weekly-increase-of-2013-as-stocks-drop

http://www.tradersmagazine.com/news/finra-exemption-exchanges-market-making-payments-111113-1.html

http://www.thetradenews.com/news/Regions/Americas/Bloomberg_lawsuit_will_not_stem_swap_futures.aspx

http://www.reuters.com/article/2013/04/19/cme-memberships-fed-idUSL2N0D51PZ20130419

http://www.chicagobusiness.com/article/20130420/ISSUE01/304209982/futures-regulators-challenged-by-changing-industry

http://www.reuters.com/article/2013/04/21/apple-earnings-options-idUSL2N0D52XU20130421

http://www.businessweek.com/news/2013-04-21/hedge-fund-gold-wagers-defy-worst-slump-in-33-years-commodities

http://www.chicagotribune.com/business/technology/chi-apple-stock-20130422,0,5775309.story?track=rss

http://www.reuters.com/article/2013/04/19/markets-options-boston-idUSL2N0D616820130419

http://www.thestreet.com/story/11900436/1/googles-gap-ibms-trap-tech-winners-losers.html?cm_ven=GOOGLEN

http://www.automatedtrader.net/headlines/142503/what-does-the-buy-side-want-a-goldilocks-approach-to-hft–regulation

http://www.reuters.com/article/2013/04/18/cme-silver-contract-idUSL3N0D54YG20130418