“Occurrence of Arbuscular Mycorrhizal Fungi After Organic Fertilization in Maize, Cowpea and Cotton Intercropping Systems - Doi: 10.4025 actasciagron.V34i2.13143”. Acta Scientiarum. Agronomy, vol. 34, nº 2, outubro de 2011, p. 149-7, https://doi.org/10.4025/actasciagron.v34i2.13143.