Mattos, Maria Laura Turino, et al. “Growth and Foliar Contents of N, P, K, Ca and Mg in Peach Cv. Diamante under Different Levels of N Applied to the Soil”. Pesquisa Agropecuaria Brasileira, vol. 26, no. 9, Sept. 1991, pp. 1315-21, doi:10.1590/S1678-3921.pab1991.v26.3471.