“ Effect of Boron and Zinc in Soluble Carbohidrate Content, Total Aminoacids and Rooting of Plum Branch Cuttings (Prunus Salicina Lindl.) ”. Scientia Agricola, vol. 50, no. 1, May 1993, pp. 13-18, https://doi.org/10.1590/S0103-90161993000100003.