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2. Ashby, M. F., & Bréchet, Y. J. M. (2003). Designing hybrid materials. Acta Materialia, 51(19), 5801–5821.
3. EN 13906-1:2013-11. (2013). Cylindrical helical springs made from round wire and bar—Calculation and design—Part 1: Compression springs; German version DIN EN 13906-1:2013, Beuth Verlag, Berlin
4. EN 13906-2:2013-09. (2013). Cylindrical helical springs made from round wire and bar—Calculation and design—Part 2: Extension springs; German version DIN EN 13906-2:2013, Beuth Verlag, Berlin
5. EN 13906-3:2014-06. (2014). Cylindrical helical springs made from round wire and bar—Calculation and design—Part 3: Torsion springs; German version DIN EN 13906-3:2014, Beuth Verlag, Berlin