BUZZ-BlackBerry Ltd: Citron Research raises price target
** Canadian smartphone maker's U.S.-listed shares up 5.9 percent at $9.63
** Investment newsletter Citron Research, typically known as a short-seller, raises price target to $20 from $15
** Citron says it is excited about new BlackBerry CEO John Chen and the future of the company's enterprise software business
** Shares surged Thursday after BlackBerry reported better-than-expected results
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