TY  - RPRT
TI  - Skin testing for tuberculosis. Antigen and observer variability.
AU  - F J Erdtmann
AU  - K E Dixon
AU  - C H Llewellyn
PY  - 1974
UR  - https://pubmed.ncbi.nlm.nih.gov/4594690/
ID  - 4594690
ER  -