Cornu, G., Lintermans, J. P., Van Den Berghe, H., & Eeckels, R. (1968). Trisomy 17-18 and trisomy 13-15 in the African child. Journal of Tropical Medicine and Hygiene, 71(4), 105-109. https://hdl.handle.net/2078.5/54238 (Original work published 1968)