1. Cox SM, Sherman ML, Leveno KJ (1990) Randomized investigation of Magnesium sulfate for prevention of preterm birth. Am J Obstet Gynecol 163: 767–772
2. Crowley P (2000) Prophylactic corticosteroids for preterm birth. Cochrane Database Syst Rev 2: CD000065
3. Crowther CA, Hiller JE, Doyle LW, Haslam RR (2003) Effect of magnesium sulphate given for neuroprotection before preterm birth. JAMA 290: 2669–2676
4. Crowther CA, Hiller JE, Doyle LW (eds) (2004) Magnesium sulphate for preventing preterm birth in threatened preterm labour (Cochrane Review). The Cochrane Library, Issue 1, 2004. John Wiley, Chichester, UK
5. Duckitt K, Thornton S (2002) Nitric oxide donors for the treatment of preterm labour. Cochrane Database Syst Rev 2002: CD002860