Analysis of Heart Rate Variability with an In-Ear Micro-Optic Sensor in View of Motion Artifacts. - Tobias Wartzek; Stefan Vogel 002; Thomas Hennig; Olaf Brodersen; Markus Hülsbusch; M. Herzog; Steffen Leonhardt (BSN, 2009)

In-Ear Vital Signs Monitoring Using a Novel Microoptic Reflective Sensor. - Stefan Vogel 002; Markus Hülsbusch; Thomas Hennig; Vladimir Blazek; Steffen Leonhardt (IEEE Trans. Inf. Technol. Biomed., 2009)