TY  - RPRT
TI  - Letter: Lecithin/sphingomyelin ratio in tracheal aspirate.
AU  - D Peleg
AU  - J A Goldman
PY  - 1976
DO  - 10.1016/s0140-6736(76)91583-x
UR  - https://pubmed.ncbi.nlm.nih.gov/58238/
ID  - 58238
ER  -