1. Baily, W.L., Jr.: An exceptional arithmetic group and its Eisenstein series. Ann. Math.91, 512–545 (1970)
2. Baily, W.L., Jr.: Introductory lectures on automorphic forms. Princeton: Princeton University Press 1973
3. Bump, D.: The Rankin-Selberg method—A survey. In:Aubert, K.E. et al. (eds.) Proceedings of Symposium in honor of A. Selberg. Oslo, 1987, Boston, MA: Academic Press 1989
4. Coxeter, H.S.M.: Integral Cayley numbers, Duke Math. J.13, 567–578 (1946)
5. Ebbinghaus, H.D. et al.: Numbers. New York Berlin Heidelberg: Springer 1990