1. BLACKMORE , S. 1976 Palynology and the systematics of tribe Cichorieae, family Compositae Ph.D. thesis
2. BOISSIER , P. E. 1839 Voyage Botanique dans le Midi de L' Espagne pendant l'Année 1837
3. The acetolysis method. A revised description;ERDTMAN;Svensk Botankisk Tidskrift,1960
4. Pollen morphology and detailed structure of family Compositae, tribe Cichorieae. II. subtribe Microseridinae;FEUER;American Journal of Botany,1977