N. Nguyen, T. Phan, C. Vo, D. Le, B. Nguyen, and H. Le, “RESEARCH ON THE FORMING ANGLE OF A1050-H14 ALUMINUM MATERIAL PROCESSED BY USING SINGLE POINT INCREMENTAL FORMING TECHNOLOGY (SPIF)”, Science and Technology Development Journal, vol. 12, no. 16, pp. 72-79, Oct. 2009.