This is an author's peer-reviewed, [ACM Word template] final manuscript, as accepted by the publisher. The published article is copyrighted by the author/owner(s) and published by the Association for Computing Machinery (ACM). It can be found at: http://dl.acm.org/citation.cfm?id=2232817
This article was first presented as a conference paper in June 2012 at the 12th ACM/IEEE-CS joint conference on Digital Libraries, Washington, D.C., U.S.A.
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