Wild ramification of moduli spaces for curves or for abelian varieties Tsutomu Sekiguchi — 1985 Compositio Mathematica
A note on extensions of algebraic and formal groups II. Noriyuki Suwa; Tsutomu Sekiguchi — 1994 Mathematische Zeitschrift
On the structure of the group scheme ℤ [ ℤ / p n ] × Tsutomu Sekiguchi; Noriyuki Suwa — 1995 Compositio Mathematica
A note on extensions of algebraic and formal gorups I. Noriyuki Suwa; Tsutomu Sekiguchi — 1991 Mathematische Zeitschrift
Théorie de Kummer-Artin-Schreier et applications Noriyuki Suwa; Tsutomu Sekiguchi — 1995 Journal de théorie des nombres de Bordeaux