@article{analgebraichardnesscriterionfor,
  title = {An Algebraic Hardness Criterion for Surjective Constraint Satisfaction},
  author = {Hubie Chen},
  year = {2014},
  eprint = {1405.4917},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1405.4917v2},
}