1. Generalisation of a theorem of Magnus;Cohn,1952
2. Cohomology theory in abstract groups;Eilenberg;Ann. Math.,1947
3. Residual properties of infinite soluble groups;Gruenberg,1957
4. Nilpotent groups;Hall,1957
5. The structure of the group-ring of a p-group over a modular field;Jennings;Trans. Am. Math. Soc.,1941