Tomohiro Okuma, Maria Evelina Rossi, Kei-ichi Watanabe, K.Yoshida. Normal Hilbert coefficients and elliptic ideals in normal 2-dimensional singularities. Nagoya Math.J. 2023. 248. 779-800
Jack Jefferies, Yusuke Nakajima, Ilya Smirnov, Kei-ichi Watanabe, Ken-ichi Yoshida. Lower bound on Hilbert-Kunz multiplicities and maximal F-signatures. Math.Proc.Camb.Phil.Soc. 2023. 174. 247-271
Okuma Tomohiro, Kei-ichi Watanabe and Ken-ichi Yoshida. The normal reduction number of two-dimensional cone-like singularities. Proc. Amer. Math. Soc. 2021. 149. 11. 4569-4581
Tony J. Puthenpurakal, Kei-ichi Watanabe, Ken-ichi Yoshida. Strong Rees property of powers of the maximal ideal and Takahashi-Dao's question. J. Algebra. 2021. 571. 297-315