@misc{indiciaebdc158b26544,
  title = {Chimpanzee copulatory behaviour.},
  author = {C E Tutin and W C McGrew},
  year = {1973},
  doi = {10.1159/000155542},
  url = {https://pubmed.ncbi.nlm.nih.gov/4766703/},
  note = {Source identifier: 4766703}
}