M. B. H. do Nascimento, V. L. A. de Lima, C. A. V. de Azevedo, and A. P. de Souza, “CHEMICAL PROPERTIES OF THE SOIL CULTIVATED WITH CASTOR OIL PLANT, IRRIGATED WITH TREATED WASTEWATER AND FERTILIZED WITH BIOSOLID”, Green Journal, vol. 4, no. 1, pp. 08–15, Feb. 2009.