1. The lumbar spine and back pain;Anderson,1980
2. Epidemiologic aspects on low back pain in industry;Andersson;Spine,1981
3. Quantitative evaluation of the activity of the back muscles in lifting;Asmussen;Communication from the Danish National Association for Infantile Paralysis,1965
4. NIOSH work practices guide for manual lifting,1981
5. Miljöbeskriving av sysselsatnigar inom byggbranchen;Bygghälsan,1977