A. Wiklund, “A study of the morphological variability in Cynara humilis L. and C. hystrix Ball (Asteraceae-Cardueae)”, Lazaroa, vol. 11, p. 19, Jan. 1989, Accessed: Feb. 04, 2026. Available: https://revistas.ucm.es/index.php/LAZA/article/view/LAZA8989110019A