@inproceedings{ballagas2008chapter,
  author = {Rafael Ballagas and Michael Rohs and Jennifer Sheridan and Jan Borchers},
  title = {The Design Space of Mobile Phone Input Techniques for Ubiquitous Computing},
  booktitle = {In: Joanna Lumsden (Ed.): Handbook of Research on User Interface Design and Evaluation for Mobile Technologies. IGI Global, Hershey, PA, USA, 2008. ISBN: 978-1-59904-871-0},
  year = {2008},
  month = jan,
}