<p></p><p>Copeland T E , Dan Galai.(1983):&nbsp;<font face="黑体"><font face="宋体"><br/>&nbsp;&nbsp;&nbsp;&nbsp;<font size="3">Information effects on the bid-ask spread</font></font><br/>&nbsp;&nbsp;</font>. Journal of Finance , 38(5) : 1457 —1469</p><p>电子链接: <a href="http://www.jstor.org/pss/2327580">http://www.jstor.org/pss/2327580</a></p>
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