HELLBERG, Manfred A. Professor ADM (David) Walker: World-class physicist (1937–2018). South African Journal of Science, [S. l.], v. 114, n. 11/12, 2018. DOI: 10.17159/sajs.2018/a0298. Disponível em: https://sajs.co.za/article/view/5817. Acesso em: 5 may. 2024.