http://www.tradersmagazine.com/news/OPTIOS-report-industry-fights-back-against-new-taxes-111136-1.html

http://www.wallstreetandtech.com/technology-risk-management/who-was-really-behind-the-twitter-hack-t/240153636

http://www.bloomberg.com/news/2013-04-26/cboe-preaches-to-vegas-choir-as-glitch-crashes-exchange.html

http://www.chicagobusiness.com/article/20130425/NEWS01/130429856/technical-glitch-that-darkens-cboe-doesnt-shake-traders?utm_source=NEWS01&utm_medium=rss&utm_campaign=chicagobusiness

http://www.chicagotribune.com/business/breaking/chi-cme-ice-rivalry-enters-biofuel-arena-20130425,0,6018744.story

http://stream.wsj.com/story/latest-headlines/SS-2-63399/SS-2-220564/

http://www.chicagotribune.com/business/breaking/chi-cboe-outage-20130425,0,2842297.story

http://online.barrons.com/article/SB50001424052748703889404578442851858877128.html?mod=BOL_da_spd

http://finance.yahoo.com/news/cboes-delayed-open-not-hacking-173816814.html

http://www.reuters.com/article/2013/04/25/options-taxes-idUSL2N0DC2EA20130425?feedType=RSS&feedName=marketsNews&rpc=43

http://www.bloomberg.com/news/2013-04-25/derivatives-revisions-blocked-by-dodd-frank-backers-himes-says.html

http://www.marketwatch.com/story/cboe-to-restart-trade-at-1250-pm-eastern-2013-04-25?siteid=yhoof2