@misc{indiciaef7372caa9189,
  title = {Ultrasonic two-axis rotation detector.},
  author = {R Rollero and M Ouaknine and J L Vercher and J L Semmlow and G M Gauthier},
  year = {1990},
  doi = {10.1109/10.55649},
  url = {https://pubmed.ncbi.nlm.nih.gov/2188901/},
  note = {Source identifier: 2188901}
}