TY  - RPRT
TI  - Measuring passive smoking: methods, problems, and perspectives.
AU  - L C Johnson
AU  - H W Letzel
PY  - 1984
DO  - 10.1016/s0091-7435(84)80020-1
UR  - https://pubmed.ncbi.nlm.nih.gov/6536945/
ID  - 6536945
ER  -