Geometric characterization of flat groups of automorphisms
Baumgartner, Udo, Schlichting, Günter, Willis, George
Hecke algebras from groups acting on trees and HNN extensions
Baumgartner, Udo, Laca, Marcelo, Ramagge, Jacqui, Willis, George
Derivations on group algebras
Ghahramani, Fereidoun, Runde, Volker, Willis, George
A noncommutative half-angle formula
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