http://seekingalpha.com/article/879571-using-weekly-options-in-a-calendar-or-diagonal-spread

http://www.reuters.com/article/2012/09/20/us-globeop-data-idUSBRE88J18S20120920

http://investorplace.com/2012/09/wade-into-a-choppier-china-with-options-cat-fcx-fxi/

http://www.cnbc.com/id/49105154

http://www.businessweek.com/articles/2012-09-20/a-shortage-of-bonds-to-back-derivatives-bets

http://uk.finance.yahoo.com/news/stocks-news-europe-call-holders-082353085.html

http://community.nasdaq.com/News/2012-09/option-premiums-are-made-of-only-these-two-things-know-your-options.aspx?storyid=175274

http://community.nasdaq.com/News/2012-09/the-vix-signals-another-trading-opportunity.aspx?storyid=175248

http://www.bloomberg.com/news/2012-09-20/brokers-need-more-discipline-to-avoid-trading-errors-finra-says.html

http://blogs.wsj.com/marketbeat/2012/09/20/traders-watch-vix-lows-with-wary-eye/

http://in.reuters.com/article/2012/09/20/idINL1E8KKCWT20120920

http://online.barrons.com/article/SB50001424053111904706204578008293672658064.html?mod=BOL_columnist_latest_col_art