Title Author Publication Date Publisher Type
    Chemical survey of some plants Growing in Qatar  Rizk, A.M.; Heiba, H.I.; Al-Easa, H.S.1989DatasetReport
    Guaianolides from Centaurea sinaica  Al-easa, Hala S.; Mann, John; Rizk, Abdel-Fattah1990ElsevierArticleReport