Huerta, Esperanza, Christian Kampichler, Violette Geissen, Susana Ochoa-Gaona, Ben de Jong, and Salvador Hernández-Daumás. 2010. “Towards an Ecological Index for Tropical Soil Quality Based on Soil Macrofauna”. Pesquisa Agropecuaria Brasileira 44 (8):1056-62. https://doi.org/10.1590/S1678-3921.pab2009.v44.1383.