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The links between the bug reports in an issue-tracking system and the corresponding fixing changes in a version repository are not often recorded by developers. Such linking information is crucial for research in mining software repositories in measuring software defects and maintenance efforts. However, the state-of-the-art bug-to-fix link recovery approaches still rely much on textual matching between bug reports and commit/change logs and cannot handle well the cases where their contents are not textually similar.
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Nguyen et al. (2012) studied this question.
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