1. A. Borlinghaus, Device for Connecting a Helical Compression Spring to the Trailing Arm in the Wheel Suspension of a Motor Vehicle, US Patent no. 4778162A1, 1988.
2. On the dynamic behavior of axially excited helical springs;Della Pietra;Meccanica,1982
3. W. Dickhart William III, H. Jun, M. James, Zwischen dem Wagenkasten eines Eisenbahnwagens und einem Drehgestell Angeordnete Mechanische Schraubenfeder, DE 3529477A1, 1985.
4. Ch. Flenker, U. Uphoff, Efficient Valve-Spring Modelling With MBS Valve-Train Design, vol. 66, MTZ 12/2005.
5. Experimental Verification of Stability of Optimal Compression Helical Springs;Krużelecki;Mechanika Teoretyczna i Stosowana,1997