@InProceedings{ruemelin2014tei,
  author = {Sonja Rümelin, Verena Lerch},
  title = {Enhancing Flat Interactive Surfaces With Hollows: Prototyping And 
Interaction Approaches},
  booktitle = {Work-In-Progress in conjunction with the 8th ACM Conference on Tangible, Embedded and Embodied Interaction (TEI '14), February 16-19, 2014, Munich, Germany.},
  series = {TEI '14},
  year = {2014},
  isbn = {-},
  location = {Munich, Germany},
  pages = {-},
  numpages = {6},
  url = {-},
  doi = {-},
  acmid = {-},
  publisher = {ACM},
  address = {New York, NY, USA},
  keywords = {Automotive user interfaces, hollows, interactive surfaces, prototyping, touch gesture}
  }