Silva, W. A., Beltrão, N. E. de M., dos Santos, J. W., Costa, F. B., & Carvalho Junior, G. S. (2013). Response surface applied to mixtures of castor bean hull and presscake for organic fertilization of castor bean plants. Agrarian, 6(22), 429–437. Recuperado de https://ojs.ufgd.edu.br/agrarian/article/view/2211