Hyper-Ring Connection Machines. - Tom Altman; Yoshihide Igarashi; Koji Obokata (Parallel Comput., 1995)

Independent Spanning Trees of Product Graphs. - Koji Obokata; Yukihiro Iwasaki; Feng Bao 004; Yoshihide Igarashi (WG, 1996)

A Probably Optimal Embedding of Hyper-Rings in Hypercubes. - Koji Obokata; Yasuaki Nishitani; Yoshihide Igarashi (Inf. Process. Lett., 1996)

Independent Spanning Trees of Chordal Rings. - Yukihiro Iwasaki; Yuka Kajiwara; Koji Obokata; Yoshihide Igarashi (Inf. Process. Lett., 1999)

Minimum-Length Polygons in Approximation Sausages. - Tetsuo Asano; Yasuyuki Kawamura; Reinhard Klette; Koji Obokata (IWVF, 2001)

Matrix rounding under the Lp-discrepancy measure and its application to digital halftoning. - Tetsuo Asano; Naoki Katoh; Koji Obokata; Takeshi Tokuyama (SODA, 2002)

Combinatorial and Geometric Problems Related to Digital Halftoning. - Tetsuo Asano; Naoki Katoh; Koji Obokata; Takeshi Tokuyama (Theoretical Foundations of Computer Vision, 2002)

Digital Curve Approximation with Length Evaluation. - Tetsuo Asano; Yasuyuki Kawamura; Reinhard Klette; Koji Obokata (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2003)

Matrix Rounding under the Lp-Discrepancy Measure and Its Application to Digital Halftoning. - Tetsuo Asano; Naoki Katoh; Koji Obokata; Takeshi Tokuyama (SIAM J. Comput., 2003)