@misc{indiciaeb343cf9e6dc6,
  title = {Sperm-counts after vasectomy.},
  author = {I Craft and P Diggory},
  year = {1973},
  doi = {10.1016/s0140-6736(73)92223-x},
  url = {https://pubmed.ncbi.nlm.nih.gov/4121863/},
  note = {Source identifier: 4121863}
}