Henry Cottam, Overland Route to China viâ Assam, Tenga Pani River, Khamti, and Singphoo Country, across the Irrawaddi River into Yunan, Proceedings of the Royal Geographical Society of London, Vol. 21, No. 6 (1876 - 1877), pp. 590-595
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Henry Cottam (1876) studied this question.