http://tickertape.tdameritrade.com/marketupdate/2017/04/cautious-tone-ahead-of-china-meeting-43012

http://in.reuters.com/article/us-euronext-clearing-interconti-exc-idINKBN1750SN

http://www.forbes.com/sites/nathanvardi/2017/04/03/the-machines-are-eating-wall-street/#5bd3ce5f73a3

http://www.marketwatch.com/story/us-stock-futures-dip-with-analysts-blaming-retreat-on-fears-over-trump-xi-summit-2017-04-04?siteid=yhoof2

http://www.thetradenews.com/Technology/Bats-boosts-index-business-with-European-additions/

http://www.marketwatch.com/story/traders-love-this-internet-stock-that-soared-10-monday-and-has-tripled-in-a-year-2017-04-04?siteid=yhoof2

http://www.foxbusiness.com/markets/2017/04/04/wall-street-braces-as-exchanges-seek-ways-to-slow-some-trading.print.html

http://www.investing.com/analysis/eyeing-the-stock-market-disconnect-as-optimism-keeps-blocking-bears-200181242

http://www.forbes.com/sites/bryanrich/2017/04/03/what-the-vix-is-telling-us-about-this-correction/#3f9587167413

https://theoptionsinsider.com/occ-cleared-contract-volume-nine-percent-march/

http://www.chicagobusiness.com/article/20170403/NEWS01/170409999/nyse-nasdaq-attack-new-chicago-trading-floor-plan-box

http://tradinggods.net/trading-gods-blog/sell-may-go-away-comes-month-early/