Acoustics & vibration of mechanical structures selected, peer reviewed papers from the XII-th International Symposium, Acoustics & Vibration of Mechanical Structures (AVMS 2013), May 23-24, 2013, Timis¿ʹoara, Romania / - Hers¿ʹianu, Nicolae.; Marinca, Vasile. (Trans Tech Publications Ltd,, 2013)