2014DIN EN 13906-3:2014-06 Cylindrical helical springs made from round wire and bar - Calculation and design - Part 3: Torsion springs; German version EN 13906-3:2014
2014DIN EN 13906-3:2014 Cylindrical helical springs made from round wire and bar - Calculation and design - Part 3: Torsion springs; German version EN 13906-3:2014
2002DIN EN 13906-3:2002 Cylindrical helical springs made from round wire and bar - Calculation and design - Part 3: Torsion springs; German version EN 13906-3:2001