SUSAN, M., ACHIŢEI, D.C., ŞTEFANICĂ, R.G. et GAVRILĂ, B.L. 2009. Variation of Mechanical Characteristics for Thin Wall Tubes Processed in Ultrasonic Field. The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science. 32, 2 (nov. 2009), 18-22.