@article{cowtan2012completion,
  title={Completion of autobuilt protein models using a database of protein fragments},
  author={Cowtan, Kevin},
  journal={Acta Crystallographica Section D: Biological Crystallography},
  volume={68},
  number={4},
  pages={328--335},
  year={2012},
  publisher={International Union of Crystallography}
}

@article{cowtan2006buccaneer,
  title={The Buccaneer software for automated model building. 1. Tracing protein chains},
  author={Cowtan, Kevin},
  journal={Acta Crystallographica Section D: Biological Crystallography},
  volume={62},
  number={9},
  pages={1002--1011},
  year={2006},
  publisher={International Union of Crystallography}
}