@INPROCEEDINGS{ASHD05a,
  author = {Mark Ashdown and Kenji Oka and Yoichi Sato},
  title = {Combining head Tracking and Mouse Input for a GUI on Multiple Monitors},
  booktitle = {CHI 2005 Extended Abstracts},
  year = {2005},
  pages = {1188--1191},
  publisher = {ACM},
  doi = {10.1145/1056808.1056873}
}