1. Profinite groups and the topological invariants of algebraic varieties;Anderson;Princeton Ph.D. Thesis,1973
2. K(π 1)'s in characteristic p > o;Friedlander;Topology,1973
3. A contribution to the theory of groups of prime power order;Hall;Proc. Lond. math. Soc.,1933
4. Group Theory;Scott,1964
5. Cohomologie Galoisienne;Serre,1965