@misc{indiciae2bb6c30592d3,
  title = {Phase contrast microscopy versus differential interference contrast microscopy as applicable to the observation of spermatozoa.},
  author = {G V Cortner and A J Boudreau},
  year = {1978},
  url = {https://pubmed.ncbi.nlm.nih.gov/370338/},
  note = {Source identifier: 370338}
}