@misc{indiciaeff2386bfd00d,
  title = {The interval between confinements.},
  author = {G N Pollard},
  year = {1975},
  doi = {10.1017/s0021932000010282},
  url = {https://pubmed.ncbi.nlm.nih.gov/1181343/},
  note = {Source identifier: 1181343}
}