Effects of ultrasound-assisted extraction conditions on the recovery of phenolic compounds and in vitro antioxidant activity of jujube (Ziziphus jujuba mill.) leaves - Zemouri-Alioui, Salima; Louaileche, Hayette; George, Béatrice (The Annals of the University Dunarea de Jos of Galati. Fascicle VI - Food Technology, 2018)