Asaro, F.; Alvarez, L. W.; Alvarez, Walter; Michel, H. V. (1983): Geochemical anomalies near the Cretaceous-Tertiary, Eocene-Oligocene and Permian-Triassic boundaries. National Aeronautics and Space Administration (NASA), Scientific and Technical Information Office, Washington, DC, United States, In: De Vincenzi, Donald L. (editor), Pleasant, Linda G. (editor), First symposium on chemical evolution and the origin and evolution of life, 2276, 90, georefid:1983-050496

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