@misc{indiciaed61463eef33c,
  title = {Immunological memory and protective immunity: understanding their relation.},
  author = {R Ahmed and D Gray},
  year = {1996},
  doi = {10.1126/science.272.5258.54},
  url = {https://pubmed.ncbi.nlm.nih.gov/8600537/},
  note = {Source identifier: 8600537}
}