Sensorial and spectrophotometrical analyze of the hydroalcoholic extracts of oak from different geographical origins - Balanuță, Anatol; Prida, Andrei; Boldurescu, Nina; Furtună, Natalia; Heymann, Hyldegarde (The Annals of the University Dunarea de Jos of Galati. Fascicle VI - Food Technology, 2007)