http://www.cboe.com/blogs/options-hub/2017/12/15/volatility-based-indicator-discussion-at-rmc-asia

http://www.investing.com/news/economic-indicators/us-industrial-production-shows-weaker-than-expected-rise-in-november-997150

http://www.cnbc.com/2017/12/15/cboe-bitcoin-futures-surge-8-percent-friday-head-for-winning-first-week.html

http://www.investing.com/news/economic-indicators/empire-state-index-continues-to-slide-in-december-996775

http://www.fool.com/investing/2017/12/15/a-big-shift-is-underway-among-cryptocurrencies-lik.aspx?source=iedfolrf0000001

http://www.cnbc.com/2017/12/15/stocks-making-the-biggest-moves-premarket-orcl-hes-adbe-cost-tmus-fit-more.html

http://www.investing.com/news/commodities-news/gold-prices-hover-near-1week-highs-on-weaker-dollar-995783

http://www.nasdaq.com/article/oil-prices-edge-up-on-north-sea-pipeline-outage-falling-stocks-20171215-00216

http://www.investing.com/news/economy-news/top-5-things-to-know-in-the-market-on-friday-996099

http://www.marketwatch.com/story/european-stocks-face-day-3-of-losses-as-retailers-banks-slide-2017-12-15