@misc{indiciae1ee5cb689999,
  title = {Electron microscopic studies on streptococci. I. M antigen.},
  author = {J Swanson and K C Hsu and E C Gotschlich},
  year = {1969},
  doi = {10.1084/jem.130.5.1063},
  url = {https://pubmed.ncbi.nlm.nih.gov/5347694/},
  note = {Source identifier: 5347694}
}