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@INPROCEEDINGS{icsm09xie,
  AUTHOR = {Guowu Xie and Jianbo Chen and Iulian Neamtiu},
  TITLE = {Towards a Better Understanding of Software Evolution: An
Empirical Study on Open Source Software},
  BOOKTITLE = {IEEE Conference on Software Maintenance},
  PAGES = {51--60},
  LOCATION = {Edmonton, Canada},
  MONTH = {September},
  YEAR = {2009}
}