Breeze: Smartphone-based Acoustic Real-time Detection of Breathing Phases for a Gamified Biofeedback Breathing Training. - Chen-Hsuan Iris Shih; Naofumi Tomita; Yanick X. Lukic; Álvaro Hernández Reguera; Elgar Fleisch; Tobias Kowatsch (Proc. ACM Interact. Mob. Wearable Ubiquitous Technol., 2019)