第一篇还差，谁能提供就是最佳答案。

1.
【作者(必填)】Yoshiaki Akeda

【文题(必填)】Another Interpretation of Negative Sharpe Ratio

【年份(必填)】2003

【全文链接或数据库名称(选填)】http://spgshop.com/anotherinterpretationofnegativesharperatio.aspx

2.
【作者(必填)】Hendrik Scholz

【文题(必填)】Refinements to the Sharpe ratio: Comparing alternatives for bear markets

【年份(必填)】2007

【全文链接或数据库名称(选填)】http://www.palgrave-journals.com/jam/journal/v7/n5/abs/2250040a.html

3.
【作者(必填)】Israelsen, Craig

【文题(必填)】A refinement to the Sharpe ratio and information ratio

【年份(必填)】2005

【全文链接或数据库名称(选填)】http://www.palgrave-journals.com/jam/journal/v5/n6/abs/2240158a.html