@misc{indiciaed2c068b32988,
  title = {Spectrograph design, 1918-68.},
  author = {R C Learner},
  year = {1968},
  doi = {10.1088/0022-3735/1/6/201},
  url = {https://pubmed.ncbi.nlm.nih.gov/4872361/},
  note = {Source identifier: 4872361}
}