@misc{indiciae96ec1c88d901,
  title = {Portable tangent screen.},
  author = {G R Mushet and C R Ellenberger},
  year = {1967},
  doi = {10.1016/0002-9394(67)91317-7},
  url = {https://pubmed.ncbi.nlm.nih.gov/6022258/},
  note = {Source identifier: 6022258}
}