1. G. Burov, “Some Mesolithic Wooden Artifacts from the Site of Vis I in the European Northeast of the USSR," The mesolithic in Europe (Donald, Edinburg, 1989), pp. 391–401.
2. P. S. C. Tacon, T. Huisheng, and M. Aubert, “Naturalistic Animals and Hand Stencils in the Rock Art of Xinjiang Uyghur autonomous region, Northwest China," Rock Art Res. 33 (1), 19–31 (2016).
3. K. Krichko, “China’s Stone Age Skiers and History’s Harsh Lessons," New York Times. 2017 Apr. 19.
4. A. Curry, “Oldest Pair of Skis Unearthed in Norwegian Ice," https://www.science.org/content/article/oldest-pair-skis-unearthed-norwegian-ice.
5. J. Fry, The Story of Modern Skiing (Hanover Univ. Press of New England, 2006).