TY  - RPRT
TI  - Amniotic fluid lecithin-sphingomyelin ratio.
AU  - J F Roux
PY  - 1973
DO  - 10.1016/0002-9378(73)90543-7
UR  - https://pubmed.ncbi.nlm.nih.gov/4688595/
ID  - 4688595
ER  -