Bagnato, G. ., Fiorenza, A. ., Cordova, F. ., Roberts, W. ., C, M. . , Jr, Greco, D. ., … Bagnato, G. . (1969). Clinical, autoimmune, and psychiatric parameters correlate with sleep disturbance in patients with systemic sclerosis and rheumatoid arthritis. Clinical and Experimental Rheumatology, 34 Suppl 100(5), 49-55. Retrieved from http://www.clinexprheumatol.org/pubmed/find-pii.asp?pii=27192425 (Original work published 1969)