J. G.  Palacios-Vargas, Castaño-Meneses, G., Gómez-Anaya, J. A., Mart\'?nez-Yrizar, A., Mej\'?a-Recamier, B. E., and Mart\'?nez-Sánchez, J., ?Litter and soil arthropods diversity and density in a tropical dry forest ecosystem in Western Mexico?, Biodiversity and Conservation, vol. 16, pp. 3703?3717, 2007.