The calculation procedure of experimental sonic generator with two resonators designed for water treatment processes - Cîrnu, Carmen; Șerban, Anca (Analele Universităţii "Dunărea de Jos" din Galaţi. Fascicula XIV, Inginerie mecanică = Annals of “Dunarea de Jos“ University of Galati. Fascicle XIV, Mechanical Engineering, 2013)