1. The splitting properties of relatively free groups;Hall, P.;Proc. London Math. Soc. (3),1954
2. On infinite soluble groups. III;Hirsch, K. A.;Proc. London Math. Soc. (2),1946
3. Residual properties of infinite soluble groups;Gruenberg, K. W.;Proc. London Math. Soc. (3),1957
4. On isomorphic matrix representations of infinite groups;Malcev, A.;Rec. Math. [Mat. Sbornik] N.S.,1940
5. A non-hopfian group;Baumslag, Gilbert;Bull. Amer. Math. Soc.,1962