Non-amenable finitely presented torsion-by-cyclic groups. Ol'shanskij, A.Yu., Sapir, M.V. (2001) Electronic Research Announcements of the American Mathematical Society [electronic only]
Non-amenable finitely presented torsion-by-cyclic groups Alexander Yu. Ol’shanskii, Mark V. Sapir (2003) Publications Mathématiques de l'IHÉS