@article{whenyoumustforgetbeyondstrong,
  title = {When You Must Forget: beyond strong persistence when forgetting in answer set programming},
  author = {Ricardo Gonçalves and Matthias Knorr and João Leite and Stefan Woltran},
  year = {2017},
  eprint = {1707.05152},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1707.05152v1},
}