SVOBODA, Jiří. On the Middle to Upper Paleolithic transition in North Eurasia. In The Middle to Upper Paleolithic transition in Eurasia: Hypotheses and facts. Rusko: Institute of Archaeology and Ethnography, Russian Academy of Sciences, Siberian Branch, 2005, p. 59-66. ISBN 5-7803-0137-9.
SPRIBILLE, Toby and Milan CHYTRÝ. Vegetation surveys in the circumboreal coniferous forests: A review. Folia Geobotanica. Pruhonice: Institute of Botany, 2002, vol. 37, No 4, p. 365-382. ISSN 1211-9520.