Yousefi, Zohreh, Kazem Negaresh, and Yusuf Kaya. “A Taxonomic Study on Psephellus Sect. Amblyopogon (Asteraceae, Cardueae—Centaureinae)”. Phytotaxa 494, no. 3 (April 7, 2021): 273–288. Accessed February 5, 2026. https://phytotaxa.mapress.com/pt/article/view/phytotaxa.494.3.3.