Spherical designs of harmonic index t. - Eiichi Bannai; Takayuki Okuda; Makoto Tagami (J. Approx. Theory, 2015)

A new relative bound for equiangular lines and nonexistence of tight spherical designs of harmonic index 4. - Takayuki Okuda; Wei-Hsuan Yu (Eur. J. Comb., 2016)

Non-existence and Construction of Pre-difference Sets, and Equi-Distributed Subsets in Association Schemes. - Hiroki Kajiura; Makoto Matsumoto; Takayuki Okuda (Graphs Comb., 2021)

On the spectrum and linear programming bound for hypergraphs. - Sebastian M. Cioaba; Jack H. Koolen; Masato Mimura; Hiroshi Nozaki; Takayuki Okuda (Eur. J. Comb., 2022)

Educational Effects in Mathematics: Conditional Average Treatment Effect depending on the Number of Treatments. - Tomoko Nagai; Takayuki Okuda; Tomoya Nakamura; Yuichiro Sato; Yusuke Sato; Kensaku Kinjo; Kengo Kawamura; Shin Kikuta; Naoto Kumano-go (CoRR, 2024)