Timmermann, J. ., B. . Poppinga, W. . Heuten, and S. . Boll. “HeartBeat: Tactile Support for Keeping a Target Heart Rate”. EAI Endorsed Transactions on Pervasive Health and Technology, vol. 3, no. 10, July 2017, p. e5, doi:10.4108/eai.13-7-2017.152889.