Developing a Multi-Platform Speech Recording System Toward Open Service of Building Large-Scale Speech Corpora. - Keita Ishizuka; Takashi Nose (CoRR, 2019)

Classification of optimal quaternary Hermitian LCD codes of dimension 2. - Keita Ishizuka (CoRR, 2020)

On the existence of quaternary Hermitian LCD codes with Hermitian dual distance 1. - Keita Ishizuka; Ken Saito (Discret. Math., 2022)

Construction for both self-dual codes and LCD codes. - Keita Ishizuka; Ken Saito (Adv. Math. Commun., 2023)

Construction of quaternary Hermitian LCD codes. - Keita Ishizuka (Cryptogr. Commun., 2023)

Orthogonal projectors of binary LCD codes. - Keita Ishizuka (CoRR, 2024)

Hadamard matrices of order 36 formed by codewords in some ternary self-dual codes. - Masaaki Harada; Keita Ishizuka (Discret. Math., 2024)

Ternary Extremal Four-Negacirculant Self-Dual Codes. - Masaaki Harada; Keita Ishizuka; Hadi Kharaghani (Graphs Comb., 2024)

Characterizations of the Minimum Weights of LCD Codes of Large Dimensions. - Makoto Araya; Masaaki Harada; Keita Ishizuka; Yuto Tanaka (IEEE Trans. Inf. Theory, 2024)