@inproceedings{ Chang:2006:Simplification,
  author = "Remco Chang and Thomas Butkiewicz and Caroline Ziemkiewicz and Zachary Wartell and Nancy S. Pollard and William Ribarsky",
  title = "Hierarchical Simplification of City Models to Maintain Urban Legibility",
  booktitle = "Proceedings of the SIGGRAPH 2006 Conference on Sketches \& Applications",
  year = "2006",
  month = aug,
  location = "Boston, Massachusetts",
  publisher = "ACM Press",
}