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Thierry, A., G. Keller, and W. Stinnesbeck. 2002. “Late Cretaceous to Early Paleocene Climate and Sea-Level Fluctuations: The Tunisian Record”. Palaeogeography, Palaeoclimatology, Palaeoecology 2754.

Keller, Gerta, and Sigal Abramovich. (2009) 2009. “Lilliput Effect in Late Maastrichtian Planktic Foraminifera: Response to Environmental Stress”. Palaeogeography, Palaeoclimatology, Palaeoecology 284 (1-2): 47-62. doi:10.1016/j.palaeo.2009.08.029.

Keller, Gerta. (2003) 2003. “Biotic Effects of Impacts and Volcanism”. Earth and Planetary Science Letters 215 (1-2): 249-64. doi:10.1016/S0012-821X(03)00390-X.