Richard F. Burton, The Lake Regions of Central Equatorial Africa, with Notices of the Lunar Mountains and the Sources of the White Nile; Being the Results of an Expedition Undertaken under the Patronage of Her Majesty's Government and the Royal Geographical Society of London, in the Years 1857-1859, The Journal of the Royal Geographical Society of London, Vol. 29 (1859), pp. 1-454
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Richard Burton (1859) studied this question.