Perez, K. S. S., Ramos, M. L. G. and McManus, C. (2004) “Microbial biomass carbon in soil cultivated with soybean, under different management systems in Cerrado”, Pesquisa Agropecuaria Brasileira, 39(6), pp. 567–573. doi: 10.1590/S1678-3921.pab2004.v39.6809.