@misc{indiciae73b8519d22a1,
  title = {Human sperm head ultrastructure: a freeze-etching study.},
  author = {J K Koehler},
  year = {1972},
  doi = {10.1016/s0022-5320(72)90118-9},
  url = {https://pubmed.ncbi.nlm.nih.gov/4556325/},
  note = {Source identifier: 4556325}
}