1. [1] O. Alvarez, T.P. Killingback, M. Mangano, and P. Windey. String theory and loop space index theorems, Comm. Math. Phys. 111:1–12, 1987.
2. [2] P.S. Aspinwall and D.R. Morrison. String theory on K3 surfaces, in: Mirror symmetry II, B. Greene and S.T. Yau, eds., AMS, 1994, pp. 703–716; hep-th/9404151.
3. [3] J.H. Conway, R.T. Curtis, S.P. Norton, R.W. Parker, and R.A. Wilson. Atlas of finite groups, Oxford University Press, Eynsham, 1985. Maximal subgroups and ordinary characters for simple groups, with computational assistance from J. G. Thackray.
4. [4] M.C.N. Cheng. K3 surfaces, N=4 dyons, and the Mathieu group M 24 , Commun. Number Theory Phys. 4:623, 2010; arXiv:1005.5415[hep-th].
5. [5] A. M. Cohen. Finite complex reflection groups, Ann. Sci. École Norm. Sup., 4:379, 1976.