Machineski, O. et al. 2011. Response of castor bean to arbuscular mycorrhizal fungi and levels of phosphorus. Semina: Ciências Agrárias. 32, 4Sup1 (Dec. 2011), 1855–1862. DOI:https://doi.org/10.5433/1679-0359.2011v32n4Sup1p1855.