A. Dechen, H. Haag, J. Sarruge, and G. Oliveira, “ Mineral nutrition of vegetable crops: XXXVI. effects of calcium levels in nutrient solution upon the concentration of B, Cu, Fe, Mn and Zn in tomato plants (Lycopevsicon esculentum Mill) ”, An. Esc. Super. Agr. Luiz de Queiroz, vol. 37, no. 2, pp. 1077–1103, Jan. 1980, doi: 10.1590/S0071-12761980000200029.