@InProceedings{cassens11:_model_with_probl_frames,
  author =	 {J\"{o}rg Cassens and Anders Kofod-Petersen},
  title =	 {Modelling with Problem Frames: The Knowledge Needed
                  for Explanation-Aware Ambient Intelligent Systems},
  booktitle =	 {Proceedings of the 11th Scandinavian Conference on
                  Artificial Intelligence},
  pages =	 {187-188},
  year =	 2011,
  editor =	 {Anders Kofod-Petersen and Fredrik Heintz and Helge
                  Langseth},
  volumn =	 227,
  month =	 {May},
  publisher =	 {IOS Press},
}