@misc{indiciaea71baf230b1b,
  title = {Sperm-counts after vasectomy.},
  author = {J M Boyce},
  year = {1973},
  doi = {10.1016/s0140-6736(73)91927-2},
  url = {https://pubmed.ncbi.nlm.nih.gov/4120411/},
  note = {Source identifier: 4120411}
}