Auberttulkens, G., Culée, C., Harmantvanrijckevorsel, K., & Rodenstein, D. (1987). Ambulatory Evaluation of Sleep Disturbance and Therapeutic Effects in Sleep-apnea Syndrome By Wrist Activity Monitoring. The American Review of Respiratory Disease, 136(4), 851-856. https://hdl.handle.net/2078.5/67779 (Original work published 1987)