1. Delivery of the second twin;Acker;Obstet. Gynecol.,1982
2. Twin delivery: influence of the presentation and method of delivery of the second twin;Adam;Am. J. Obstet. Gynecol.,1991
3. Pons JC, Charlemaine C, Papiernik E. Les grossesses multiples. Paris: Flammarion-Médecine-Sciences, 2000. p. 311.
4. Influence of antenatal betamethasone and gender cohabitation on outcome of twins pregnancies 24–34 weeks of gestation;Ardila;Semin. Perinatol.,1994
5. Management of twin pregnancy: the vaginal route is still safe;Laros;Am. J. Obstet. Gynecol.,1988