Strelin, J., and E. Malagnino. “Charles Darwin and the Oldest Glacial Events in Patagonia: The Erratic Blocks of the Río Santa Cruz Valley”. Revista De La Asociación Geológica Argentina, vol. 64, no. 1, Mar. 2009, pp. 101-8, https://revista.geologica.org.ar/raga/article/view/1334.