TY  - RPRT
TI  - Atmospheric aerosol: does a background level exist?
AU  - W M Porch
AU  - R J Charlson
AU  - L F Radke
PY  - 1970
DO  - 10.1126/science.170.3955.315
UR  - https://pubmed.ncbi.nlm.nih.gov/5460032/
ID  - 5460032
ER  -