Improving tameness for metabelian groups. Bogley, W.A., Harlander, J. (2004) The New York Journal of Mathematics [electronic only]
Infinite soluble groups with no outer automorphisms Derek J. S. Robinson (1980) Rendiconti del Seminario Matematico della Università di Padova
Infinite two-generator groups of class two and their non-abelian tensor squares. Sarmin, Nor Haniza (2002) International Journal of Mathematics and Mathematical Sciences