@article{therelationshipbetweenknowledgebeliefand,
  title = {The Relationship between Knowledge, Belief and Certainty},
  author = {Joseph Y. Halpern},
  year = {2013},
  eprint = {1304.1508},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1304.1508v1},
}