Brito, José Félix, Leonardo Theodoro Büll, Napoleão Esberard Beltrão, João Paulo Gonsiorkiewicz Rigon, e Valdinei Sofiatti. 2014. “Absorption and Critical Levels of Phosphorus in Castor Bean Shoots Grown in Different Soil Classes”. Semina: Ciências Agrárias 35 (1):239-50. https://doi.org/10.5433/1679-0359.2014v35n1p239.