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2. Diagnosis of the respiratory distress syndrome by amniocentesis;Gluck;Am J Obstet Gynecol,1971
3. The lecithinsphingomyelin ratio of amniotic fluid: an index of fetal lung maturity;Roux;Pediatr,1972
4. Amniotic fluid lecithin/sphingomyelin ratio as an index of fetal maturity;Spellacy;Obstet Gynecol,1972
5. Studies of human amniotic fluid phospholipids in normal, diabetic and drugabuse pregnancy;Singh;Am J Obstet Gynecol,1974