1. Lawson JS, Mayberry P. How can infant and perinatal mortality rates be compared internationally? In: World health forum 1994; 15 (1): 85–88: 1994; 1994.
2. Newborn Mortality. [https://www.who.int/news-room/fact-sheets/detail/levels-and-trends-in-child-mortality-report-2021].
3. Lander T. Neonatal and perinatal mortality: country, regional and global estimates. World Health Organization; 2006.
4. Standard terminology for fetal, infant, and perinatal deaths;Barfield WD;Pediatrics,2016
5. IGME U. : Levels & trends in child mortality: report 2019, estimates developed by the United Nations Inter-agency Group for Child Mortality Estimation. URL: i>https://www unicef org/media/79371/file/UN-IGME-child-mortality-report-2020 pdf 2019.