Radmann, Elizete Beatriz, and Roberto Pedroso de Oliveira. “Characterization of Citrus Apirenic Fresh Fruit Cultivars by Morphological Descriptors”. Pesquisa Agropecuaria Brasileira, vol. 38, no. 9, Sept. 2003, pp. 1123-9, doi:10.1590/S1678-3921.pab2003.v38.6681.