Extensions of finite group schemes, and Hopf Galois theory over a complete discrete valuation ring. C. Greither — 1992 Mathematische Zeitschrift
Annihilators for the class group of a cyclic field of prime power degree C. Greither; R. Kučera — 2004 Acta Arithmetica
On a conjecture concerning minus parts in the style of Gross C. Greither; Radan Kučera — 2008 Acta Arithmetica