@misc{indiciae6a058a5c1a55,
  title = {Letter: Microbial-antigen detection.},
  author = {B M Greenwood and P Tugwell and H C Whittle},
  year = {1974},
  doi = {10.1016/s0140-6736(74)91925-4},
  url = {https://pubmed.ncbi.nlm.nih.gov/4140313/},
  note = {Source identifier: 4140313}
}