Recognizing the Repeatable Configurations of Time-Reversible Generalized Langton's Ant Is PSPACE-Hard. - Tatsuie Tsukiji; Takeo Hagiwara (Algorithms, 2011)

Computational Complexity of Predicting Periodicity in the Models of Lorentz Lattice Gas Cellular Automata. - Takeo Hagiwara; Tatsuie Tsukiji; Zhi-Zhong Chen (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2016)

Hardness of Approximation for Langton's Ant on a Twisted Torus. - Takeo Hagiwara; Tatsuie Tsukiji (Algorithms, 2020)

Model and Analysis of Forklift Motion for Extracting Operational Factors of Accidents. - Takeo Hagiwara; Toshiyuki Murakami (AMC, 2024)

Influence Analysis of Mutual Entrainment at the Hip Joint on the Degree of Synchronization between Gait Cycle and the Cycle of Stimuli. - Koichiro Kubota; Takeo Hagiwara; Toshiyuki Murakami (ICIT, 2025)