Eyles, Nicholas. “Frozen in Time: Concepts of ’Global Glaciation’ from 1837 (die Eiszeit) to 1998 (the Snowball Earth)”. Geoscience Canada 31, no. 4 (December 1, 2004). Accessed November 22, 2024. https://journals.lib.unb.ca/index.php/GC/article/view/2775.