“Arbuscular mycorrhizal fungi within agroforestry and traditional land use systems in semi-arid Northeast Brazil - doi: 10.4025/actasciagron.v35i3.16213”, Acta Sci. Agron., vol. 35, nº 3, p. 307–314, fev. 2013, doi: 10.4025/actasciagron.v35i3.16213.