References analysis of the Wikipedia article "Snowball Earth" in the English version

caltech.edu (Global: 887^th place; English: 714^th place)

gps.caltech.edu

Kirschvink, J. L. (1992). "Late Proterozoic low-latitude global glaciation: The snowball Earth" (PDF). In Schopf, J. W.; Klein, C. (eds.). The Proterozoic Biosphere: A Multidisciplinary Study. Cambridge University Press. pp. 51–2.

web.gps.caltech.edu

doi.org (Global: 2^nd place; English: 2^nd place)

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Spencer, A. M. (1971). Late Precambrian Glaciation in Scotland. Geological Society of London. p. 2. doi:10.1144/GSL.MEM.1971.006.01.01.

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