Second derivative analysis of forehead photoplethysmographic signal in healthy volunteers and diabetes patients [Electronic resource]Pilt, Kristjan; Meigas, Kalju; Temitski, Kristina; Viigimaa, MargusWorld Congress on Medical Physics and Biomedical Engineering May 26-31, 2012, Beijing, China2012 / p. 410-413 : ill [CD-ROM] https://link.springer.com/chapter/10.1007/978-3-642-29305-4_109 https://doi.org/10.1007/978-3-642-29305-4_109 Conference Proceedings at Scopus Article at scopus