@article{nestedaggregatesinanswersetsan,
  title = {Nested Aggregates in Answer Sets: An Application to a Priori Optimization},
  author = {Emad Saad},
  year = {2013},
  eprint = {1304.2799},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1304.2799v1},
}