J. G. Wynn, Z. Alemseged, R. Bobe, F. E. Grine, E. W. Negash, and M. Sponheimer. Isotopic evidence for the timing of the dietary shift toward C-4 foods in eastern African Paranthropus. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, volume 117, issue 36, pages 21978-21984, 2020.