Michel, Helen V; Asaro, Frank; Alvarez, Walter; Alvarez, Luis W; Johnson, David A (1983): Abundance profiles of iridium and other elements near the Cretaceous/Tertiary boundary in Hole 516F of Deep Sea Drilling Project Leg 72. In: Barker, PF; Carlson, RL; Johnson, DA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 72, 931-936, doi:10.2973/dsdp.proc.72.148.1983