Dantas, Adriana Cibele de Mesquita, et al. “Embryo Rescue from Interspecific Crosses in Apple Rootstocks”. Pesquisa Agropecuaria Brasileira, vol. 41, no. 6, June 2006, pp. 969-73, doi:10.1590/S1678-3921.pab2006.v41.7233.