@Article{desctowa04a,
  author = "J. Delgrande and T. Schaub and H. Tompits and K. Wang",
  title = "A Classification and Survey of Preference Handling Approaches in Nonmonotonic Reasoning",
  journal = "Computational Intelligence",
  year = 2004,
  volume = 20,
  number = 2,
  pages = "308-334"
}