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Cotton MF, Donald PR, Aalbers C.Cotton MF, et al. Among authors: donald pr.Childs Nerv Syst. 1991 Nov;7(7):399-401. doi: 10.1007/BF00304206.Childs Nerv Syst. 1991.PMID: 1794121
Muller PD, Donald PR, Burger PJ, van der Horst W.Muller PD, et al. Among authors: donald pr.S Afr Med J. 1989 Sep 2;76(5):214-5.S Afr Med J. 1989.PMID: 2772770
Donald PR, Seifart H.Donald PR, et al.Pediatr Infect Dis J. 1988 Jul;7(7):469-71. doi: 10.1097/00006454-198807000-00003.Pediatr Infect Dis J. 1988.PMID: 3405648