@misc{indiciaebccc82012b22,
  title = {Tuberculin testing antigens and techniques.},
  author = {R A MacLean},
  year = {1975},
  doi = {10.1378/chest.68.3\_supplement.455},
  url = {https://pubmed.ncbi.nlm.nih.gov/1157563/},
  note = {Source identifier: 1157563}
}