[1]
D. van Dyk, R. L. Llewellyn, P. C. Gordon, and J. G. Brink, “Sylvia Annigje Magdalena Heijke (1955 - 2022)”, S Afr Med J, vol. 113, no. 5, p. 4, May 2023, Accessed: Oct. 12, 2025. [Online]. Available: https://samajournals.co.za/index.php/samj/article/view/898