@inproceedings{offutt2006class,
  author={Offutt, A.J. and Ma, Y.S. and Kwon, Y.R.},
  title={The class-level mutants of MuJava},
  booktitle={Proceedings of the 2006 international workshop on Automation of software test},
  year={2006},
  pages={78--84},
  organization={ACM}
}