Spectral characterization of the bioactive principles and antibacterial properties of cold methanolic extract of Olea europaea from the Hail region of Saudi Arabia oleh Rahamat Unissa Syed, Sivakumar S. Moni, Raghad Huraid Alfaisal, Rawan Hamdan Alrashidi, Nouf Fahad Alrashidi, Khadijah Mansour Wadeed, Fayha Nafea Alshammary, Alshammari Majd Habib, Fai Mutaz Alharbi, Zia ur Rehman, Md Shamsher Alam, Vinod Kumar Basode, Ahmed A. Abdulhaq