1. G. De Geer, 11th International Geological Congress (1910), Stockholm, Sweden, 1912, vol. 1, 241 (1912).
2. R. S. Bradley. Paleoclimatology: Reconstructing Climates of the Quaternary (3rd ed.), Elsevier/Academic Press, San Diego (2014).
3. E. K. Ojala, P. Francus, B. Zolitschka, M. Besonen, and S. F. Lamoureux, Quaternary Sci. Rev. 43, 45 (2012).
4. R. A. Aliev, V. A. Bobrov, St. N. Kalmykov, M. S. Melgunov, I. E. Vlasova, V. P. Shrevchenko, A. N. Novigatsky, and A. P. Lisitsin, Jpourn. Radioanalytical and Nuclear Chemistry 274 (2), 315 (2007).
5. A. V. Darin, I. A. Kalugin, and Y. V. Rakshun, Transactions RAS, Physical Series 77 (2), 204 (2013).