Comparison of detrended fluctuation analysis and spectral analysis for heart rate variability in sleep and sleep apnea. - Thomas Penzel; Jan W. Kantelhardt; Ludger Grote; Jörg-Hermann Peter; Armin Bunde (IEEE Trans. Biomed. Eng., 2003)

Detection of cardiovascular risk from a photoplethysmographic signal using a matching pursuit algorithm. - Dirk Sommermeyer; Ding Zou; Joachim H. Ficker; Winfried Randerath; Christoph Fischer; Thomas Penzel; Bernd Sanner; Jan Hedner; Ludger Grote (Medical Biol. Eng. Comput., 2016)