M. SUSAN, D. C. ACHIŢEI, R. G. ŞTEFANICĂ, et B. L. GAVRILĂ, 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, vol. 32, nᵒ 2, p. 18-22, nov. 2009.