Arora, R., W. Kaeosuriya, and A. Jongpoo. “Neonatal Survival Co-efficient of Very Low Birthweight Infant”. Thai Journal of Obstetrics and Gynaecology, vol. 19, no. 3, Apr. 2012, pp. 90-96, https://he02.tci-thaijo.org/index.php/tjog/article/view/1238.