1. The Problem of Burnside and Identities in Groups;Adian,1975
2. G. Bergman, Questions in algebra
3. Laws in nilpotent-by-finite groups;Cossey;Proc. Amer. Math. Soc.,1968
4. Analytic Pro-p;Dixon,1991
5. Groups of polynomial growth and expanding maps;Gromov;Publ. Math. Inst. hautes Étud. Sci.,1981