Timmermann, Janko, Wilko Heuten, and Susanne Boll. “Input Methods for the Borg-RPE-Scale on Smartwatches”. EAI Endorsed Transactions on Energy Web 2, no. 6 (August 3, 2015): e3. Accessed July 3, 2024. https://publications.eai.eu/index.php/ew/article/view/1068.