Brorsson, S., M. Hilliges, C. Sollerman, and A. Nilsdotter. “A Six-Week Hand Exercise Programme Improves Strength and Hand Function in Patients With Rheumatoid Arthritis”. Journal of Rehabilitation Medicine, vol. 41, no. 5, Feb. 2009, pp. 338-42, doi:10.2340/16501977-0334.