S.  Anduaga and Halffter, G., ?Micofagia en Scarabaeidae?, Simposio Nacional sobre la interaccion, pp. 151-169, 1991.

G.  Halffter, Favila, M. E., and Halffter, V., ?A comparative study of the structure of the scarab guild in Mexican tropical rain forests and derived ecosystems?, Folia Entomológica Mexicana, vol. 84, pp. 131-156, 1992.

A.  Estrada, Halffter, G., Coates-Estrada, R., and Meritt, D., ?Dung beetles attracted to mammalian herbivore (Alouatta palliata) and omnivore (Nasua narica) dung in the tropical rain forest of Los Tuxtlas, Mexico?, Journal of Tropical Ecology, vol. 9, pp. 45-54, 1993.

J. R.  Verdu, Moreno, C. E., Sanchez-Rojas, G., Numa, C., Galante, E., and Halffter, G., ?Grazing promotes dung beetle diversity in the xeric landscape of a Mexican Biosphere Reserve?, Biological Conservation, vol. 140, pp. 308-317, 2007.