Shadow Play using Ultrasound Levitated Props. - Shutaro Aoyama; Kei Asano (UIST (Adjunct Volume), 2022)

HMDspeller: Fast and Hands-free Text Entry System for Head Mount Displays using Silent Spelling Recognition. - Kei Asano; Naoki Kimura; Jun Rekimoto (CHI Extended Abstracts, 2023)