Porto, F., de Leeuw, R., Evans, D. R., Carlson, C. R., Yepes, J. F., Branscum, A., & Okeson, J. P. (1969). Differences in psychosocial functioning and sleep quality between idiopathic continuous orofacial neuropathic pain patients and chronic masticatory muscle pain patients. Journal Of Orofacial Pain, 25(2), 117-24. (Original work published 1969)