Lukas Humpe Simon Friedrich Murillo Janik Muires Peter A. Gloor The Rhythm of Flow: Detecting Facial Expressions of Flow Experiences Using CNNs. 1138-1147 2023 April - June 14 IEEE Trans. Affect. Comput. 2 https://doi.org/10.1109/TAFFC.2021.3087222 db/journals/taffco/taffco14.html#HumpeMMG23