TY  - RPRT
TI  - [A study on the decrease of potency of PPD solution. Experiments using 3 H-PPD].
AU  - M Toyohara
AU  - M Orii
PY  - 1972
UR  - https://pubmed.ncbi.nlm.nih.gov/5012048/
ID  - 5012048
ER  -