1. The fetus of multiple gestation;Guttmacher;Obstet & Gynec,1958
2. Intravenous oxytocin stimulation in the second stage of labour in twin pregnancies. A report of 22 cases;Wood;Am J Obstet & Gynec,1963
3. Twin pregnancy: Morbidity and fetal mortality;Robertson;Obstet & Gynec,1964
4. Survival and management of the second-born twin;Thompson;Obstet & Gynec,1966
5. Twin survival: A comparison of mortality rates in the first and second twins;Corston;Obstet & Gynec,1957