Dynamical Calling Behavior Experimentally Observed in Japanese Tree Frogs (Hyla japonica). - Ikkyu Aihara; Shunsuke Horai; Hiroyuki Kitahata; Kazuyuki Aihara; Kenichi Yoshikawa (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2007)

Firm Evidence of Chaos for heartbeats in dogs under Constant Flow Ventilation. - Terumi Nakai; Yoshito Hirata; Shunsuke Horai; Michio Akagi; Kazuyuki Aihara (Int. J. Bifurc. Chaos, 2010)

Faithfulness of Recurrence Plots: A Mathematical Proof. - Yoshito Hirata; Motomasa Komuro; Shunsuke Horai; Kazuyuki Aihara (Int. J. Bifurc. Chaos, 2015)