Johnson ED, Gonzalez JP, Georges A (1993). "Filovirus activity among selected ethnic groups inhabiting the tropical forest of equatorial Africa". Transactions of the Royal Society of Tropical Medicine and Hygiene. 87 (5): 536–538. doi:10.1016/0035-9203(93)90077-4. PMID8266403.
Johnson ED, Gonzalez JP, Georges A (1993). "Filovirus activity among selected ethnic groups inhabiting the tropical forest of equatorial Africa". Transactions of the Royal Society of Tropical Medicine and Hygiene. 87 (5): 536–538. doi:10.1016/0035-9203(93)90077-4. PMID8266403.