Chemical composition and protective role of Pulicaria undulata (L.) C.A. Mey. subsp. undulata against gastric ulcer induced by ethanol in rats oleh Abdelgawad A. Fahmi, Mariam Abdur-Rahman, Asmaa F. Aboul Naser, Manal A. Hamed, Howaida I. Abd-Alla, Nagwa M.M. Shalaby, Mohamed I. Nasr