@misc{indiciaebb5b3334217e,
  title = {Liquid level detector for use by the blind.},
  author = {R W Roberts and G Jernakoff},
  year = {1973},
  doi = {10.1063/1.1686093},
  url = {https://pubmed.ncbi.nlm.nih.gov/4685104/},
  note = {Source identifier: 4685104}
}