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Joubert JJ, Schutte CH, Irons DJ, Fripp PJ (1993). “Ubombo and the site of David Bruce's discovery of Trypanosoma brucei”. Transactions of the Royal Society of Tropical Medicine and Hygiene87 (4): 494–5. doi:10.1016/0035-9203(93)90056-V. PMID8249096.