TY  - RPRT
TI  - Permissible levels for occupational exposure; basic concepts.
AU  - R L Zielhuis
AU  - W R Notten
PY  - 1979
DO  - 10.1007/bf00377781
UR  - https://pubmed.ncbi.nlm.nih.gov/422268/
ID  - 422268
ER  -