Heart Rate Variability-Based Driver Drowsiness Detection and Its Validation With EEG. - Koichi Fujiwara; Erika Abe; Keisuke Kamata; Chikao Nakayama; Yoko Suzuki; Toshitaka Yamakawa; Toshihiro Hiraoka; Manabu Kano; Yukiyoshi Sumi; Fumi Masuda; Masahiro Matsuo; Hiroshi Kadotani (IEEE Trans. Biomed. Eng., 2019)