TY  - RPRT
TI  - Normal flora and respiratory tract pathogens.
AU  - S L Berk
PY  - 1984
DO  - 10.7326/0003-4819-100-2-320_2
UR  - https://pubmed.ncbi.nlm.nih.gov/6607011/
ID  - 6607011
ER  -