@misc{indiciaef7c7a48e6314,
  title = {[Studies using special tuberculin (PPD) vet. "Dessau"].},
  author = {W Richter and A Grässer and W Mai and E Kallenbach},
  year = {1971},
  url = {https://pubmed.ncbi.nlm.nih.gov/5111068/},
  note = {Source identifier: 5111068}
}