Spectroscopic and density functional theory studies of 5,7,3′,5′-tetrahydroxyflavanone from the leaves of Olea ferruginea. - Hashmi, Muhammad Ali; Khan, Afsar; Ayub, Khurshid; Farooq, Umar (Spectrochimica Acta Part A: Molecular & Biomolecular Spectroscopy, 2014)