Dulyaphat, W., and T. Chullapram. “Factors Associated with Neonatal Morbidity or Early Neonatal Mortality in Twin Pregnancies at Chonburi Hospital”. Thai Journal of Obstetrics and Gynaecology, vol. 23, no. 3, Sept. 2015, pp. 136-43, doi:10.14456/tjog.2015.16.