NOBEL, P. S. Letter to Editor by Dr. Park S. Nobel. Journal of the Professional Association for Cactus Development, [S. l.], v. 17, 2015. DOI: 10.56890/jpacd.v17i.149. Disponível em: https://www.jpacd.org/jpacd/article/view/149. Acesso em: 16 oct. 2025.