FábiánSzabolcs Ákos, and Bertalan Radvánszky. “Symposium on "The 100-Year-Old Concept of Ice Age"”. Hungarian Geographical Bulletin 58, no. 4 (December 20, 2009): 297-301. Accessed May 18, 2024. https://ojs3.mtak.hu/index.php/hungeobull/article/view/3172.