Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Gi-Seong Ryu and Jiwoo You and Vladislav Kostianovskii and Eung-Bin Lee and Youngjoo Kim and Cheolsoo Park and Yong-Young Noh,Flexible and Printed PPG Sensors for Estimation of Drowsiness,IEEE Transactions on Electron Devices,0018-9383,Institute of Electrical and Electronics Engineers (IEEE),2018-07,65,7,2997-3004,https://cir.nii.ac.jp/crid/1360292620665614208,https://doi.org/10.1109/ted.2018.2833477