1. On elastic wave propagation in helical springs;Wittrick;Int. J. Mech. Sci.,1965
2. The propagation of waves of elastic displacement along a helical wire;Love;Trans. Camb. Phil. Soc.,1899
3. Instability of springs;Haringx;Philips Tech. Rev.,1950
4. On the highly compressible helical springs and rubber rods, and their application to vibration-free mountings;Haringx;Philips Res. Lab. Rep.,1948
5. On the buckling and lateral rigidity of helical compression springs 2;Haringx,1942