1. Adams, J. F., Stable homotopy and generalised homology, Chicago Lectures in Mathematics, University of Chicago Press, Chicago, Ill., 1974.
2. Ando, Matthew, “Power operations in elliptic cohomology and representations of loop groups”, Trans. Amer. Math. Soc., 352 (2000) No. 12, 5619–5666.
3. Ando, M. and Hopkins, M. and Strickland, N., “The sigma orientation is an H ∞ map”, manuscript, UIUC, 2002.
4. Artin, M., “Versal deformations and algebraic stacks”, Invent. Math., 27 (1974), 165–189.
5. Atiyah, M. F., “Vector bundles and the Kiinneth formula”, Topology, 1 (1962), 245–248.