1. Periodicity in groups;Alperin;Illinois J. Math.,1977
2. Resolutions and periodicity;Alperin;Proc. Amer. Math. Soc.,1973
3. Projectivity and relative projectivity over group rings;Chouinard;J. Pure Appl. Algebra,1976
4. D. Eisenbud, Homological algebra on a complete intersection with an application to group representations, to appear.
5. The cohomology ring of a finite group;Evens;Trans. Amer. Math. Soc.,1961