Authors: D A Luthy; K K Shy; G van Belle; E B Larson; J P Hughes; T J Benedetti; Z A Brown; S Effer; J F King; M A Stenchever Journal: Obstet Gynecol Date: 1987-05 Impact factor: 7.661
Authors: K J Leveno; F G Cunningham; S Nelson; M Roark; M L Williams; D Guzick; S Dowling; C R Rosenfeld; A Buckley Journal: N Engl J Med Date: 1986-09-04 Impact factor: 91.245