Coser, T. R., Ramos, M. L. G., Amabile, R. F., & Júnior, W. Q. R. (2007). Microbial biomass nitrogen in cerrado soil with nitrogen fertilizer application. Pesquisa Agropecuaria Brasileira, 42(3), 399–406. https://doi.org/10.1590/S1678-3921.pab2007.v42.7581