• Flavonoids from Centaurea sinaica 

      Al-Easa, Hala S.; Kamel, Alaa; Rizk, Abdel-Fattah M. (1992 , Article)
      Four Newly isolated flavonoids from Centaurea sinaica
    • Guaianolides from Centaurea sinaica 

      Al-easa, Hala S.; Mann, John; Rizk, Abdel-Fattah ( Elsevier , 1990 , Article  &   Report)
      Three sesquiterpene lactones were isolated from the aerial parts of Centaurea sinaica: amberboin, chlorohyssopifolin A and sinaicin. The latter is reported for the first time.