Gertsch, B., G. Keller, T. Adatte, and D. Bartels. 2011. “Platinum Group Element (PGE) Geochemistry of Brazos Sections, Texas, U.S.A.”. In The End-Cretaceous Mass Extinction and the Chicxulub Impact in Texas, SEPM, Special Publication, No. 100:227-49. Tulsa: SEPM (Society for Sedimentary Geology).

Gertsch, B., G. Keller, T. Adatte, and D. Bartels. 2011. “Trace-Element Geochemistry of Brazos Sections, Texas, U.S.A.”. In The End-Cretaceous Mass Extinction and the Chicxulub Impact in Texas, SEPM, Special Publication, No. 100:251-79. Tulsa: SEPM (Society for Sedimentary Geology).