Narrowband RF distance measurement using phase locked FM transceivers. - Jaap C. Haartsen; A. Stek; Frank N. M. Hooijschuur; T. J. Hulshof (SCVT, 2016)

Heart rate monitoring using infrared thermometry in an earpiece. - Daniel Kuratomi Cruz; Ger de Graaf; Jaap C. Haartsen; Frank N. M. Hooijschuur; Paddy J. French (IEEE SENSORS, 2017)

Heart Rate Extraction in a Headphone Using Infrared Thermometry. - Ger de Graaf; Daniel Kuratomi Cruz; Jaap C. Haartsen; Frank N. M. Hooijschuur; Paddy J. French (IEEE Trans. Biomed. Circuits Syst., 2019)