Keller, G, and Wolfgang Stinnesbeck. 1996. “Sea-Level Changes, Clastic Deposits, and Megatsunamis across the Cretaceous-Tertiary Boundary”. The Cretaceous Tertiary Boundary Mass Extinction: Biotic and Environmental Changes, 415-49.

Keller, G. (1984) 1984. “The Paleogene Neogene Boundary in the Equatorial Pacific Ocean. In: Gelati, R. & Steininger”. Rivista Italiana Di Paleontologia E Stratigrafia 89.

Plafker, G, G Keller, and JD Barron. 1985. “Paleontologic Data on the Age of the Orca Group, Alaska Report 85”. 85-429. United States Department of the Interior, Geological Survey.

Pardo, A, N Ortiz, and G Keller. 1996. “Latest Maastrichtian and K T Boundary Foraminiferal Turnover and Environmental Changes at Agost, Spain”. In The Cretaceous-Tertiary Mass Extinction: Biotic and Environmental Effects, 157-91. New York: Norton Press.

Keller, G. (2007) 2007. “The Chicxulub Impact and K-T Mass Extinction in Texas”. XLVII (9). Bulletin of the South Texas Geol. Soc.. San Antonio: South Texas Geol. Soc.

Stüben, D, U Kramar, Z Berner, W Stinnesbeck, G Keller, and T Adatte. (2002) 2002. “Trace Elements, Stable Isotopes, and Clay Mineralogy of the Elles II K–T Boundary Section in Tunisia: Indications for Sea Level Fluctuations and Primary Productivity”. Palaeogeography, Palaeoclimatology, Palaeoecology 178 (3-4): 321-45. doi:10.1016/S0031-0182(01)00401-1.

Kramar, U, D üben, Z Berner, W Stinnesbeck, H Philipp, and G Keller. (2001) 2001. “Are Ir Anomalies Sufficient and Unique Indicators for Cosmic Events?”. Planetary and Space Science 49 (8): 831-37. doi:10.1016/S0032-0633(01)00036-8.

Stinnesbeck, W, P Schulte, F Lindenmaier, T Adatte, M Affolter, L Schilli, G Keller, et al. (2001) 2001. “Late Maastrichtian Age of Spherule Deposits in Northeastern Mexico: Implication for Chicxulub Scenario”. Canadian Journal of Earth Sciences 38 (2): 229-38. doi:10.1139/e00-061.

Keller, G, H. Khozyem, T. Adatte, and J Spangenberg, eds. 2013. “Biostratigraphy and Foraminiferal Paleoecology of the Early Eocene Naredi Formation, SW Kutch, India”. In Proceedings of XXIII Indian Colloquium on Micropaloentology and Stratigraphy and International Symposium on Global Bioevents in Earth’s History, Special Publication. Vol. 1. Bangalore: Geological Society of India. Referenced from www.geosocindia.com: Biostratigraphy and foraminiferal paleoecology of the Early Eocene Naredi Formation, SW Kutch, India.

Lu, GY, T Adatte, G Keller, and N Ortiz. 1998. “Abrupt Climatic, Oceanographic and Ecologic Changes Near the Paleocene-Eocene Transition in the Deep Tethys Basin: The Alademilla Section, Southern Spain”. Eclogae Geologicae Helveticae 91: 293–306. Referenced from serials.unibo.it: Abrupt climatic, oceanographic and ecologic changes near the Paleocene-Eocene transition in the deep Tethys basin: The Alademilla section, southern Spain.