Color image contrast enhacement method based on differential intensity/saturation gray-levels histograms. - Keita Nakai; Yoshikatsu Hoshi; Akira Taguchi (ISPACS, 2013)

Impact of Competition in Energy Market on Promotion of Renewables: An Agent-Based Model Approach. - Arashi Ogihara; Kengo Suzuki; Keita Nakai (ISAGA, 2019)

Discrete universality theorem for Matsumoto zeta-functions and nontrivial zeros of the Riemann zeta-function. - Keita Nakai (Math. Model. Anal., 2025)