Perez, K. S. S., Ramos, M. L. G., & McManus, C. (2005). Microbial biomass nitrogen in soil cultivated with soybean, under different management systems, in the Cerrado. Pesquisa Agropecuaria Brasileira, 40(2), 137–144. https://doi.org/10.1590/S1678-3921.pab2005.v40.6934