@misc{indiciae88116193c18f,
  title = {An improved apparatus for scotometry.},
  author = {J P LLOYD and A C HOULTON and V PURVIS},
  year = {1953},
  doi = {10.1016/0002-9394(53)91898-4},
  url = {https://pubmed.ncbi.nlm.nih.gov/13090260/},
  note = {Source identifier: 13090260}
}