Theorell, T, et al. “Physical Strength and Endurance in Relation to Perceived Psychosocial Work Environment, Sleep Disturbance and Coping Strategies in Men. Stockholm MUSIC I (MUsculo-Skeletal Intervention Centre) Study Group, Stockholm”. Journal of Rehabilitation Medicine, vol. 27, no. 2, June 1995, pp. 67-71, doi:10.2340/1650197719956771.