@misc{indiciae1803b5502cdf,
  title = {A modified mask for "open" ether.},
  author = {C V Singh and G L Kamra},
  doi = {10.1111/j.1365-2044.1979.tb06385.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/517728/},
  note = {Source identifier: 517728}
}