Marinho, Cláudia Sales, et al. “Influence of Thinning and Foliar Fertilization of ‘Pon Kan’ Tangerine Trees (<i>Citrus reticulata< i> Blanco) on the Quality of the Fruits”. Pesquisa Agropecuaria Brasileira, vol. 28, no. 9, Sept. 1993, pp. 1019-23, doi:10.1590/S1678-3921.pab1993.v28.3965.