NCAYIYANA, D J. Prof. JP van Niekerk (1936 - 2025). South African Medical Journal, South Africa, v. 116, n. 1, p. e4798, 2026. DOI: 10.7196/. Disponível em: https://www.samajournals.co.za/index.php/samj/article/view/4798. Acesso em: 19 apr. 2026.