J. D. Ramos and M. Pasqual, “Modifications on polyembryony and identification of the hybrid in seeds from lemon ’cravo’ pollimated with Poncirus trifoliata (L.) Raf”., PAB, vol. 27, no. 3, pp. 423–427, Mar. 1992, doi: 10.1590/S1678-3921.pab1992.v27.3665.