@inproceedings{kratz2009unobtrusive,
  author = {Kratz, Sven and Rohs, Michael},
  title = {Unobtrusive Tabletops: Linking Personal Devices with Regular Tables},
  year = {2009},
  month = apr,
  booktitle = {Workshop Multitouch and Surface Computing at CHI'09},
  location = {Boston, MA, USA},
}