Asaro, Frank; Alvarez, Luis W.; Alvarez, Walter; Michel, Helen V. (1982): Geochemical anomalies near the Eocene/Oligocene and Permian/Triassic boundaries. Geological Society of America (GSA), Boulder, CO, United States, In: Silver, Leon T. (editor), Schultz, Peter H. (editor), Geological implications of impacts of large asteroids and comets on the Earth, 190, 517-528, georefid:1983-039507

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