@misc{indiciae625eb6f708a5,
  title = {Variable colour-amplitude phase-contrast microscopy.},
  author = {R BARER},
  year = {1949},
  doi = {10.1038/1641087b0},
  url = {https://pubmed.ncbi.nlm.nih.gov/15399599/},
  note = {Source identifier: 15399599}
}