@misc{indiciae086213b7511a,
  title = {An age-structured model for pertussis transmission.},
  author = {H W Hethcote},
  year = {1997},
  doi = {10.1016/s0025-5564(97)00014-x},
  url = {https://pubmed.ncbi.nlm.nih.gov/9309930/},
  note = {Source identifier: 9309930}
}