I can not find the following 4 papers by $\textit{Sekiguchi-Suwa}$ in their works over $\textit{Kummer-Artin-Schreier-Witt theory}$ :
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1-On the unified Kummer-Artin-Schreier-Witt theory - Prépublications du laboratoire de Mathématiques Pures de Bordeaux, Prépublication n◦ 111 (1999).
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2-On the unified Kummer-Artin-Schreier-Witt sequences
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3-Théories de Kummer-Artin-Schreier-Witt - C. R. Acad. Sci. Paris 319
(1994),105-110.
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4-Theorie de Kummer-Artin-Schreier - C. R. Acad.
Sci. Paris 312 (1991), 417-420.
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I will be very happy if someone can help me.
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Thanks.