Make once, play anywhere!: EPUB 3 interactive function enables us to make and play game software anywhere! - Shigeto Okuda; Keiji Emi (GCCE, 2013)

EPUB-type visual novel gives us happy math: A prototype of edutainment software on math. - Keiji Emi; Shigeto Okuda (GCCE, 2016)

Text Data Analysis on Answers Written in Japanese to Free Text Questions Obtained at Astronomy Lectures. - Seiichiro Aoki; Kazushi Sakka; Keiji Emi; Shinzo Kobayashi; Toshio Okamoto (OCCE, 2020)

Text-mining Analysis of What Students Think About e-learning and Face-to-face Classes during COVID-19. - Minae Nishimoto; Keiji Emi (J. Inf. Process., 2024)