@misc{indiciae80dc3a0e79c8,
  title = {Virtual trackballs revisited.},
  author = {Knud Henriksen and Jon Sporring and Kasper Hornbaek},
  doi = {10.1109/tvcg.2004.1260772},
  url = {https://pubmed.ncbi.nlm.nih.gov/15384645/},
  note = {Source identifier: 15384645}
}