?url_ver=Z39.88-2004&rft_id=3347836&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=+B%C3%A1nhalmi+Andr%C3%A1s&rft.aulast=B%C3%A1nhalmi&rft.aufirst=Andr%C3%A1s&rft.pages=Paper+4038034-15+p.&rft.title=JOURNAL+OF+HEALTHCARE+ENGINEERING&rft.volume=2018&rft.atitle=Analysis+of+a+Pulse+Rate+Variability+Measurement+Using+a+Smartphone+Camera&rft.issn=2040-2295&rft.date=2018&rft.genre=article