@misc{indiciae109c46f28e2d,
  title = {[Differing penicillin sensitivity within a Staphylococcus population and its demonstration by penicillic acid].},
  author = {W Ritzerfeld and L Schulte},
  year = {1965},
  url = {https://pubmed.ncbi.nlm.nih.gov/5865135/},
  note = {Source identifier: 5865135}
}