1. Allday, C., Puppe, V.: Cohomological methods in transformation groups. Cambridge Stud. Adv. Math., vol. 32. Cambridge Univ. Press, Cambridge (1993)
2. Avramov, L.L., Buchweitz, R.-O.: Lower bounds for Betti numbers. Compos. Math. 86, 147–158 (1993)
3. Avramov, L.L., Buchweitz, R.-O., Christensen, L.W., Iyengar, S., Piepmeyer, G.: Homotopical algebra of differential modules. (In preparation)
4. Avramov, L.L., Buchweitz, R.-O., Iyengar, S., Miller, C.: Homology of perfect complexes. http://arxiv.org/abs/math.AC/0609008
5. Buchsbaum, D., Eisenbud, D.: Algebra structures for finite free resolutions, and some structure theorems for ideals of codimension 3. Am. J. Math. 99, 447–485 (1977)