Guillen-Trujillo, A. et al. 2020. Germination of Ferocactus townsendianus Britton & Rose. with scarification of seeds subjected to different storage times. Investigación y Ciencia de la Universidad Autónoma de Aguascalientes. 79 (Jan. 2020), 44–51. DOI:https://doi.org/10.33064/iycuaa2020792929.