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booktitle = {2012 International Conference on Software and System Process ({ICSSP})},  }  @book{Gibson_2006,  year = {2006},  month = {aug},  publisher = {Software Engineering Institute},  author = {Diane Gibson and Dennis Goldenson and Keith Kost},  title = {Performance Results of CMMI-Based Process Improvement},  }  @inproceedings{Buttler_1995,  year = {1995},