Crusciol, Carlos Alexandre Costa, et al. “Nutrients Extraction and Exportation by Savana Castor Bean Hybrid: II – Micronutrients”. Semina: Ciências Agrárias, vol. 33, no. 6Supl1, Dec. 2012, pp. 2637-56, doi:10.5433/1679-0359.2012v33n6Supl1p2637.