Latado, Rodrigo Rocha, et al. “Correlations Between Pollen Grain Viability and Fruit Characteristics in ‘Pêra’ Sweet Orange Mutants”. Pesquisa Agropecuaria Brasileira, vol. 39, no. 10, Oct. 2004, pp. 961-5, doi:10.1590/S1678-3921.pab2004.v39.6863.