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…the American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Values (TLV): Lifting Beyond 30 Degrees Torso Asymmetry, 9th International Conference on Applied Human Factors and Ergonomics, Orlando, FL, July 21-25, 2018. 6. Viswanathan M, Jorgensen MJ and Kittusamy NK, (2006), Field Evaluation of a Continuous Passive Lumbar Motion…
https://www.wichita.edu/profiles/academics/engineering/ISME/01_Faculty/Jorgensen-Michael.php