Gazzola, R. and de Souza, M. (1994) “Foliar fertilization and thinning of Ponkan tangerine trees (<i>Citrus reticulata</i> Blanco) on the quality of the fruits”, Pesquisa Agropecuaria Brasileira, 29(5), pp. 785–790. doi: 10.1590/S1678-3921.pab1994.v29.4116.