1. BS5240 General purpose industrial safety helmets;BSI,1975
2. BS6658 Protective helmets for vehicle users;BSI,1985
3. BS5240 Industrial safety helmets. Part I. Specification for construction and performance;BSI,1987
4. Effect of polystyrene foam liner density on motorcycle helmet shock absorption;Gale;Plastics and Rubber Proc. Appl.,1985
5. Fast fracture of rubber toughened thermoplastics used for the shells of motorcycle helmets;Gilchrist;J. Mater. Sci.,1987