@misc{indiciaefd4bd6e9faed,
  title = {Placentation in the adder, Vipera berus.},
  author = {R BELLAIRS and I GRIFFITHS and AD'A BELLAIRS},
  year = {1955},
  doi = {10.1038/176657b0},
  url = {https://pubmed.ncbi.nlm.nih.gov/13265805/},
  note = {Source identifier: 13265805}
}