@inproceedings{katz2013who,
  title={Who said we need to relax all variables?},
  author={Katz, Michael and Hoffmann, J{\"o}rg and Domshlak, Carmel},
  booktitle={Proceedings of the 23rd International Conference of Automated Planning and Scheduling},
  year={2013},
  pages={126--134}
}