Koch, Alan Scaffolds and integral Hopf Galois module structure on purely inseparable extensions. (English) Zbl 1318.16030 New York J. Math. 21, 73-91 (2015). Reviewer: George Szeto (Peoria) MSC: 16T05 11R33 11S15 12F15 PDF BibTeX XML Cite \textit{A. Koch}, New York J. Math. 21, 73--91 (2015; Zbl 1318.16030) Full Text: EMIS arXiv
Koch, Alan Hopf Galois structures on primitive purely inseparable extensions. (English) Zbl 1307.16028 New York J. Math. 20, 779-797 (2014). Reviewer: George Szeto (Peoria) MSC: 16T05 PDF BibTeX XML Cite \textit{A. Koch}, New York J. Math. 20, 779--797 (2014; Zbl 1307.16028) Full Text: EMIS arXiv
Koch, Alan Height one Hopf algebras in low ramification. (English) Zbl 1096.16017 New York J. Math. 10, 295-306 (2004). Reviewer: Lindsay N. Childs (Albany) MSC: 16W30 14L15 14L05 PDF BibTeX XML Cite \textit{A. Koch}, New York J. Math. 10, 295--306 (2004; Zbl 1096.16017) Full Text: EMIS EuDML
Koch, Alan Lifting Witt subgroups to characteristic zero. (English) Zbl 0919.14030 New York J. Math. 4, 127-136 (1998). Reviewer: M.Kolster (Hamilton/Ontario) MSC: 14L05 13K05 14G20 PDF BibTeX XML Cite \textit{A. Koch}, New York J. Math. 4, 127--136 (1998; Zbl 0919.14030) Full Text: EMIS EuDML