P. P. Semenof, John Michell, First Ascent of the Tian-Shan or Celestial Mountains, and Visit to the Upper Course of the Jaxartes or Syr-Daria, in 1857, The Journal of the Royal Geographical Society of London, Vol. 31 (1861), pp. 356-366
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Semenof et al. (1861) studied this question.
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