1. Burnside metabelian groups;Bachmuth, S.;Proc. Roy. Soc. London Ser. A,1968
2. Construction of a non-solvable group of exponent 5;Bachmuth, S.,1973
3. R. H. Bruck, Engel conditions in groups and related questions, Lecture Notes, Australian National University, Canberra, Jan. 1963.
4. On groups of exponent four;Gupta, Narain D.;J. Algebra,1971
5. On groups of exponent four with generators of order two;Gupta, Narain D.;Bull. Austral. Math. Soc.,1974