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Schaaf HS, Donald PR, Scott F.Schaaf HS, et al. Among authors: donald pr.J Trop Pediatr. 1991 Oct;37(5):223-5. doi: 10.1093/tropej/37.5.223.J Trop Pediatr. 1991.PMID: 1784054
de Beer FC, Nel AE, Gie RP, Donald PR, Strachan AF.de Beer FC, et al. Among authors: donald pr.Thorax. 1984 Mar;39(3):196-200. doi: 10.1136/thx.39.3.196.Thorax. 1984.PMID: 6710428Free PMC article.
Gie RP, Beyers N, Schaaf HS, Nel ED, Smuts NA, van Zyl S, Donald PR.Gie RP, et al. Among authors: donald pr.S Afr Med J. 1995 Jul;85(7):658-62.S Afr Med J. 1995.PMID: 7482084
Schaaf HS, Beyers N, Gie RP, Nel ED, Smuts NA, Scøtt FE, Donald PR, Fourie PB.Schaaf HS, et al. Among authors: donald pr.Pediatr Infect Dis J. 1995 Mar;14(3):189-94.Pediatr Infect Dis J. 1995.PMID: 7761183
Smuts NA, Beyers N, Gie RP, Schaaf HS, Talent JM, Nel E, van Zyl S, Donald PR.Smuts NA, et al. Among authors: donald pr.Pediatr Radiol. 1994;24(7):478-80. doi: 10.1007/BF02015003.Pediatr Radiol. 1994.PMID: 7885777Clinical Trial.
Beyers N, Gie RP, Schaaf HS, van Zyl S, Nel ED, Talent JM, Donald PR.Beyers N, et al. Among authors: donald pr.Tuber Lung Dis. 1994 Aug;75(4):260-5. doi: 10.1016/0962-8479(94)90130-9.Tuber Lung Dis. 1994.PMID: 7949071