Conf.dr.ing. Nitoi Dan Florin, Amza Gheorghe, Semenescu Augustin, Conf.dr.ing. Chivu Oana Roxana, Sef lucr.dr.ing. Amza Zoia. RESEARCHES ON AIR PURIFICATION USING ULTRASONIC FILTERS. SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 17th International Multidisciplinary Scientific GeoConference SGEM2017, Energy and Clean Technologies, 2017, pp. 483-490. https://doi.org/10.5593/sgem2017h/43/s19.061