Alvarez, Roberto, Oscar José Santanatoglia, Peter Engelbert Daniel, and Roberto García. 1995. “Respiration and Specific Activity of Soil Microbial Biomass under Conventional and Reduced Tillage”. Pesquisa Agropecuaria Brasileira 30 (5):701-9. https://doi.org/10.1590/S1678-3921.pab1995.v30.4356.