G. S. Azar, A. S. F. de Araújo, M. E. de Oliveira, and D. M. M. R. Azevêdo, “Soil microbial biomass and activity under pasture monoculture and silvopastoral systems”, Semina: Ciênc. Agrár., vol. 34, no. 6, pp. 2727–2736, Dec. 2013.