@misc{indiciae1b42be4b8852,
  title = {Antigenic variants of influenza A virus obtained in vitro.},
  author = {L R Haaheim and G C Schild},
  year = {1976},
  url = {https://pubmed.ncbi.nlm.nih.gov/62624/},
  note = {Source identifier: 62624}
}