M. Brunet, F. Guy, D. Pilbeam, H. T. MacKaye, A. Likius, D. Ahounta, A. Beauvilain, C. Blondel, H. Bocherens, J.-R. Boisserie, L. de Bonis, Y. Coppens, J. Dejax, C. Denys, P. Duringer, V. Eisenmann, G. Fanone, P. Fronty, D. Geraads, T. Lehmann, F. Lihoreau, A. Louchart, A. Mahamat, G. Merceron, G. Mouchelin, O. Otero, P. P. Campomanes, M. P. D. Le\'on, J.-C. Rage, M. Sapanet, M. Schuster, J. Sudre, P. Tassy, X. Valentin, P. Vignaud, L. Viriot, A. Zazzo, and C. P. E. Zollikofer. A new hominid from the Upper Miocene of Chad, Central Africa. Nature, volume 418, issue 6894, pages 145-151, January 2002. D. E. Lieberman, B. A. Wood, and D. R. Pilbeam. Homoplasy and early Homo: an analysis of the evolutionary relationships of H. habilis sensu stricto and H. rudolfensis. J. Hum. Evol., volume 30, issue 2, pages 97-120, 1996. M. Brunet, A. Beuvilain, Y. Coppens, E. Heintz, A. Moutaye, and D. Pilbeam. The first australopithecine 2,500 kilometres west of the Rift Valley (Chad). Nature, volume 378, pages 273-275, 1995. E. L. Simons, D. Pilbeam, and P. C. Ettel. Controversial taxonomy of fossil hominids. Science, science.sciencemag.org, volume 166, issue 3902, pages 258-259, October 1969.