C. C. Cuchiara, M. C. Winhelmann, C. F. Larré, J. A. Fernando, E. J. B. Braga, and J. A. Peters, “Physiological responses of sweet potato (Ipomoea batatas L.) plants due to different copper concentrations”, Semina: Ciênc. Agrár., vol. 36, no. 6Supl2, pp. 4165–4176, Dec. 2015.