Lüdecke, T., J.N. Leichliter, D. Stratford, D.M. Sigman, H.B. Vonhof, G.H. Haug, M. Bamford, and A. Martínez-García. 2025. “Australopithecus at Sterkfontein Did Not Consume Substantial Mammalian Meat”. Science 387: 309-14. doi:10.1126/science.adq7315.

Sigman, D.M., M.A. Altabet, D.C. McCorkle, R. François, and G. Fischer. 2000. “The δ15N of Nitrate in the Southern Ocean: Nitrogen Cycling and Circulation in the Ocean Interior”. Journal of Geophysical Research: Oceans 105. Blackwell Publishing Ltd: 19599-614. doi:10.1029/2000jc000265.