Valdez-Cepeda, R. D., Blanco-Macías, F., Gallegos-Vázquez, C., Salinas-García, G. E. and Vázquez-Alvarado, R. E. (2001) “Freezing Tolerance of Opuntia spp”., Journal of the Professional Association for Cactus Development, 4, pp. 105–116. doi: 10.56890/jpacd.v4i.133.