On graph theory Mertens' theorems. - Takehiro Hasegawa; Seiken Saito (Graphs Comb., 2016)

A proof of Terras' conjecture on the radius of convergence of the Ihara zeta function. - Seiken Saito (Discret. Math., 2018)

A note on the moments of the Kesten distribution. - Takehiro Hasegawa; Seiken Saito (Discret. Math., 2021)

Lattice sums of I-Bessel functions, theta functions, linear codes and heat equations. - Takehiro Hasegawa; Hayato Saigo; Seiken Saito; Shingo Sugiyama (CoRR, 2023)