J. L. Junior, R. M. Boaretto, M. L. de S. Silva, D. Correia, C. P. Cabral, and E. Malavolta, “Deficiencies of macronutrients on nutritional status of castor bean cultivar Iris”, PAB, vol. 40, no. 2, pp. 145–151, Feb. 2005, doi: 10.1590/S1678-3921.pab2005.v40.6935.