http://www.bloomberg.com/news/articles/2015-04-30/spoofing-elephant-in-room-goes-unmentioned-on-cme-earnings-call

http://finance.yahoo.com/news/traders-run-bearish-energy-bets-154206863.html

http://www.reuters.com/article/2015/04/29/highfrequencytrading-lawsuits-idUSL1N0XQ1BZ20150429

http://blogs.wsj.com/moneybeat/2015/04/29/options-volume-slid-in-first-quarter/

http://www.bloomberg.com/news/articles/2015-04-30/india-s-vix-poised-for-monthly-gain-before-april-futures-expire

http://www.wsj.com/articles/cmes-profit-rises-on-higher-trading-volumes-1430392342

http://www.newsweek.com/flash-crash-case-doesnt-add-326066

http://www.marketwatch.com/story/nasdaq-apologizes-for-posting-twitter-earnings-early-2015-04-29?siteid=yhoof2

http://www.reuters.com/article/2015/04/27/markets-credit-idUSL1N0XL14A20150427

http://www.nytimes.com/2015/04/28/opinion/the-trader-as-scapegoat.html?_r=0

http://www.cboeoptionshub.com/2015/04/28/not-the-perfect-bullish-breakout-but-weekly-market-outlook/

http://www.bloomberg.com/news/articles/2015-04-29/ackman-activism-deja-vu-evoked-as-railroad-options-surge