Degano, C., M.E. Alonso, J. Ochoa, and A. Catan. 1997. “Seed Characterization and Scanning Electron Microscope (SEM) Morphology of the Testa of Three Groups of Argentine Opuntia Ficus-Indica (Cactaceae)”. Journal of the Professional Association for Cactus Development 2 (January):103-13. https://doi.org/10.56890/jpacd.v2i.175.