1. Anonymous, MEYRA, Internal Market Analysis Report, 1996.
2. E. Bekaris, Exploitation strategy, TRANSWHEEL Deliverable, No. 2.1, 1997.
3. Low back pain and whole-body vibration;Pope;Clinical Orthopaedics and Related Research,1998
4. Epidemiologic aspects on low-back pain in industry;Andersson;Spine,1981
5. Investigation of the relation between low back pain and occupation. IV. Physical requirements;Magora;Scandinavian Journal of Rehabilitation Medicine,1973