@InProceedings{  kpotter:2004a,
  author = 	 "Kristin Potter and David Johnson and Elaine Cohen",
  title = 	 "Height Field Haptics",
  booktitle =    "Proceedings of the 12th International Symposium on Haptics",
  pages = 	 "258--265",
  year = 	 "2004",
}