@misc{indiciae7ce6203dc5ed,
  title = {Polymorphism in West African snails.},
  author = {J F Barker},
  year = {1968},
  doi = {10.1038/hdy.1968.7},
  url = {https://pubmed.ncbi.nlm.nih.gov/5245624/},
  note = {Source identifier: 5245624}
}