http://www.ftseglobalmarkets.com/issues/issue-68-february-march-2013/competition-heats-up-in-equity-options.html

http://www.tradersmagazine.com/news/nyse-puts-block-crosses-onto-floor-traders-handheld-devices-110895-1.html

http://derivative-news.fincad.com/derivatives-regulations/expected-timeline-for-finalizing-otc-derivatives-regulations-not-enough-says-opinion-piece-2-3216/

http://www.investopedia.com/articles/optioninvestor/09/bear-vertical-put-spread.asp#axzz2LS7XU9jl

http://www.bloomberg.com/news/2013-02-19/oil-options-volatility-rises-as-crude-gains-on-seaway-increase.html

http://www.reuters.com/article/2013/02/19/us-financial-regulation-exchanges-idUSBRE91I15720130219

http://blogs.wsj.com/marketbeat/2013/02/19/market-malaise-leaves-options-looking-cheap/

http://tech.fortune.cnn.com/2013/02/19/apple-einhorn-greenlight-lawsuit/

http://www.bloomberg.com/news/2013-02-19/sec-s-walter-seeks-rule-requiring-exchanges-to-test-technology.html

http://online.barrons.com/article/SB50001424052748704103204578314042069563354.html?mod=BOL_options_home

http://www.bizjournals.com/cincinnati/news/2013/02/19/fifth-third-downgraded-as-options.html

https://theoptionsinsider.com/tradingtechnology/?p=100009434&qcABC=1