A Multi-Stage, Multi-Feature Machine Learning Approach to Detect Driver Sleepiness in Naturalistic Road Driving Conditions. - Bram Bakker; Bartosz Zablocki; Angela Baker; Vanessa Riethmeister; Bernd Marx; Girish Iyer; Anna Anund; Christer Ahlström (IEEE Trans. Intell. Transp. Syst., 2022)