1. W.A. Courtney, Device incorporating elastic fluids and viscous damping, World Intellectual Property Organisation, WO 97/25551, 1997.
2. W.A. Courtney, Improved impact absorber with viscous damping, World Intellectual Property Organisation, PCT/GB98/03594, 1998.
3. W.A. Courtney, Impact absorbent building structures, British Patent Office, GB9805887.8, 1998.
4. Elastic response of flexible polyurethane foams in uniaxial tension;El-Ratal;J. Eng. Mater. Technol.,1996
5. Shock mitigating foams. 2. Dynamic characteristics;Richardson;Cellul. Polym.,1987