1. 1) Bovenzi M, Hulshof CTJ (1999) An updated review of epidemiologic studies on the relationship between exposure to whole-body vibration and low back pain (1986-1997). Int Arch Occup Environ Health 72, 351-65.
2. 2) Comité Européen de Normalisation (1996) Mechanical vibration - guide to the health effects of vibration on the human body. CR Report 12349. CEN, Brussels.
3. 3) Bongers PM, Boshuizen HC (1990) Back disorders and whole-body vibration at work. Academisch Proefschrift. Universiteit van Amsterdam, Amsterdam.
4. 4) Burdorf A, Sorock G (1997) Positive and negative evidence on risk factors for back disorders. Scand J Work Environ Health 23, 243-56.
5. 5) National Institute for Occupational Safety and Health (1997) Musculoskeletal disorders and workplace factors ―a critical review of epidemiologic evidence for work-related musculoskeletal disorders of the neck, upper extremity, and low back. DHHS (NIOSH) Publication No. 97-141, Cincinnati.