@misc{indiciae4e5223c55dfd,
  title = {Microscopic photodensitometry and microspectrophotometry using a fixed double-aperture optical system and an electronically controlled automatic scanning microscope stage.},
  author = {E A Tonna and E J Rogers},
  year = {1968},
  doi = {10.1111/j.1365-2818.1968.tb00598.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/5656936/},
  note = {Source identifier: 5656936}
}