Automorphisms and extensions of k((t))

Fujiwara, 1988, On Galois actions on p-power torsion points of some one-dimensional formal groups over Fp[[t]], J. Algebra, 113, 491, 10.1016/0021-8693(88)90175-5

Keating, 1988, Galois characters attached to formal A-modules, Compositio Math., 67, 241

Sen, 1969, On automorphisms of local fields, Ann. of Math. (2), 90, 33, 10.2307/1970680

Serre, 1962

Wintenberger, 1980, Extensions abéliennes et groupes d'automorphismes des corps locaux, C. R. Acad. Sci. Paris, 290, A201

Wintenberger, 1983, Le corps des normes de certaines extensions infinies de corps locaux; applications, Ann. Sci. École Norm. Sup., 16, 59, 10.24033/asens.1440