"On German Nihilism" (1999, originally a 1941 lecture), Interpretation 26, no. 3 edited by David Janssens and Daniel Tanguay.
doi.org
dx.doi.org
Schmidt, Gavin A.; Frank, Adam «The Silurian hypothesis: would it be possible to detect an industrial civilization in the geological record?». International Journal of Astrobiology, 2018. DOI: htt10.1017/S1473550418000095.