Pasqual, Moacir, et al. “Nucellar Embryogenesis <i>in in vitro< i> Culture of Abortive Ovules of ’pera’ Sweet Orange”. Pesquisa Agropecuaria Brasileira, vol. 24, no. 12, Apr. 2014, pp. 1507-11, doi:10.1590/S1678-3921.pab1989.v24.16611.