Farge E, Fri G (2013) Accessed 20 September; http://www.Reuters.com.
 Banabic D (2009) Sheet metal forming processes. Springer, Berlin.
 Aleksandrovic S, Stefanovic M, Adamovic D, Lazic V (2009) Variation of normal anisotropy ratio r during plastic forming. Strojniškivestnik 55(6): 392-399.
 Hosford WF, Caddell RM (2007) Metal forming: mechanics and metallurgy. 3rd edn. New York, Cambridge.
 Trzepiecinski T (2010) 3D Elasto-plastic FEM analysis of the sheet drawing of anisotropic steel sheet. Archives of Civil and Mechanical Engineering 10(4): 95-106.
 Kosareenia E, Alizadeh Y (2008) Study of normal anisotropic effect in metalic sheets on formability problems. Proc. 10th Conf. Manufacturing and Production Engineering, Babol, Iran. (In Persian)
 Sorkhabi A.H, Ghaneipour A.K (2012) Measurement of strain in tensile test by video processing, Iran eleventh Student Conference on Electrical Engineering, Kashan, Iran. (In Persian)
 Khalili K, Eftekhari shahri Ehsan (2003) The use of image processing techniques for automatic calculation of local strain. ISME16, Kerman, Iran.
 Li X (2000) Spatial characterization of unstable plastic flows in two aluminum alloys. PhD Thesis, Department of Mechanical Engineering, Yale University, New Haven, CT.
 Schreier HW, Braasch JR, Sutton MA (2000) Systematic errors in digital image correlation caused by intensity interpolation. Opt. Eng. 39, 2915-2921.
 Tong W, Zhang N (2001) An experimental investigation of necking in thin sheets. Proc. ASME Manufacturing Engineering Division MED, New York, A12.
 Vacher P, Haddad A, Arrieux R (1999) Determination of the forming limit diagrams using image analysis by the corelation method. CIRP Annals-Manufacturing Technology 48(1): 227-230.
 Rommel C, Victor S (2008) Strain measurements with the digital image correlation system Vic-2D. System, 106: p. 2D.
 Gonzalez RC, Wintz P (1987) Digital image processing. Addision-Wesley Publishing Company: 275-281.
 Siegert K, TALAT Lecture 3705, http://www.eaa.net/eaa/education/TALAT/index.htm