1. Lecithin/sphingomyelin ratios in amniotic fluid in normal and abnormal pregnancy;Gluck;Am. J. Obstet. Gynecol,1973
2. The lecithin/sphingomyelin ratio in a high risk obstetric population;Aubry;Obstet. Gynecol,1976
3. Amniotic fluid lecithin/sphingomyelin ratio as an index of fetal maturity;Spellacy;Obstet. Gynecol,1972
4. Ideas and actions—factors, other than surfactant, in the etiology of respiratory distress syndrome;Pender;Obstet. Gynecol,1976
5. Surface tension of amniotic fluid lipid extracts: Prediction of pulmonary maturity;Goldkrand;Am. J. Obstet. Gynecol,1977