1. Computer modelling of bumper impact resistance;Tang,1979
2. A high energy level pneumatic energy absorbing bumper;Gieck;SAE paper no. 730029,1972
3. Metal foams as energy absorbers for automobile bumpers;Neibylski;SAE paper no. 720490,1979
4. Impact testing of high-density semirigid urethane foam for automotive bumper applications;Limbert;SAE paper no. 720132,1972
5. Bumper energy attenuators made from fibre reinforced plastic;McDougall;SAE paper no. 790334,1979