Optical density at 650 nm in amniotic fluid, L/S ratio and foam test as indicators of fetal lung maturity.

@article{Bustos1980OpticalDA,
  title={Optical density at 650 nm in amniotic fluid, L/S ratio and foam test as indicators of fetal lung maturity.},
  author={Ra{\'u}l Bustos and P Estol and A Fasanello and Mar{\'i}a Cecilia Scorza and Gustavo Giussi},
  journal={Journal of perinatal medicine},
  year={1980},
  volume={8 6},
  pages={278-83}
}