1. On the p-adic completions of nonnilpotent spaces;Bousfield;Trans. Am. Math. Soc.,1992
2. Identities among relations;Brown,1982
3. Aspherical group presentations;Chiswell;Math. Z.,1981
4. Tannakian categories;Deligne,1982
5. Relation modules of finite groups;Gruenberg,1976