TY  - RPRT
TI  - Determining fetal lung maturity: a sensitive surfactant method.
AU  - L W Johnson
PY  - 1977
DO  - 10.1016/0002-9378(77)90743-8
UR  - https://pubmed.ncbi.nlm.nih.gov/578389/
ID  - 578389
ER  -