Cabero L, Escribano I, Sáez J, Calaf J, Durán-Sánchez P, Esteban-Altirriba J
Eur J Obstet Gynecol Reprod Biol. 1979 Dec;9(6):375-8. doi: 10.1016/0028-2243(79)90130-8.
In 87 premature labors, 31 were treated with betamimetic drugs. The incidence of RDS in the treated group has been lower than in the non-treated group, especially when gestational age was shorter than 35 wk and when newborn's weight was lower than 2000 g.