@misc{indiciaebd8470e25121,
  title = {Letter: How many bars make a grating?},
  author = {D H Kelly},
  year = {1975},
  doi = {10.1016/0042-6989(75)90314-4},
  url = {https://pubmed.ncbi.nlm.nih.gov/1136179/},
  note = {Source identifier: 1136179}
}