1. European Standard EN 10 130: 1991. Cold rolled low carbon steel flat products for cold forming—Technical delivery conditions, European Committee for Standardization, Brussels, Belgium, 1991.
2. Stahl-Eisen-Prüfblatt 1126. Ermittlung der senkrechten Anisotropi (r-Wert) von Feinblech im Zugversuch, 1. Ausgabe, Verlag Stahleisen, Düsseldorf, 1984.
3. A. Van Bael, J. Winters, P. Van Houte, in: S.I. Andersen, J.B. Bilde-Sørensen, T. Lorentzen, O.B. Pedersen, N.J. Sørensen (Eds.), Proceedings of the 15th Risø International Symposium on Materials: Numerical Predictions of Deformation Processes and the Behaviour of Real Materials, Roskilde, Denmark, 1994, p. 225.
4. ASTM Standard E 517-92a: Standard Test Method for Plastic Strain Ratio r for Sheet Metal, Annual Book of ASTM Standards, vol. 3 (1), ASTM, Philadelphia, PA, 1995, 486 pp.