Alvarez, R., Santanatoglia, O. J., Daniel, P. E., & García, R. (1995). Respiration and specific activity of soil microbial biomass under conventional and reduced tillage. Pesquisa Agropecuaria Brasileira, 30(5), 701–709. https://doi.org/10.1590/S1678-3921.pab1995.v30.4356