Effective lifting of 2-cocycles for Galois cohomology
We give explicit formulas for reducing the problem of determining whether a given 2-cocycle is a coboundary and if so finding a lifting 1-cochain to a system of norm equations.
Einbettungsprobleme und Galoisstruktur lokaler Körper.
Erratum. Quelques remarques sur le -invariant
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Extensions centrales de groupes algébriques simplement connexes et cohomologie galoisienne
Extensions non abéliennes de degré d’un corps de nombres : étude locale-globale