C. Cîrnu and A. Șerban, “The calculation procedure of experimental sonic generator with two resonators designed for water treatment processes”, Analele Universităţii "Dunărea de Jos" din Galaţi. Fascicula XIV, Inginerie mecanică = Annals of “Dunarea de Jos“ University of Galati. Fascicle XIV, Mechanical Engineering, vol. 20, no. 2, pp. 53-56, Oct. 2013.