some useful links

http://bbs.wenxuecity.com/finance/3344607.html
一个按月定期投资计算器 ZT

http://bbs.wenxuecity.com/finance/3367196.html
双子塔

http://seekingalpha.com/instablog/14324642-growfast/2634551-dgaz-risk-analysis?source=kizur_seekingalpha
DGAZ Risk Analysis 
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