1. An investigation into crane accidents, their causes and repair costs;Butler;Cranes Today,1978
2. An investigation into crane accidents, their causes and repair costs;Butler;Cranes Today,1978
3. An investigation into crane accidents, their causes and repair costs;Butler;Cranes Today,1978
4. An investigation into crane accidents, their causes and repair costs;Butler;Cranes Today,1978
5. Characterization of safety criteria for load-bearing materials and components, particularly in lifting tackle;Häkkinen,1985