Oliveira, G.D. de, et al. “ Non Root Feeding With Two Sources of Zinc on Coffea arábica L. ’mundo novo’(B.Rodr.) Choussy ”. Anais Da Escola Superior De Agricultura Luiz De Queiroz, vol. 38, no. 1, Jan. 1981, pp. 23-70, https://doi.org/10.1590/S0071-12761981000100005.