1. Bass, H., Milnor, J., Serre, J.-P.: Solution of the congruence subgroup problem forSL n n?3) andSp 2n (n?2). Publ. Math. Inst. Hautes Etud. Sci.33, 59?137 (1967); Erratum, ibid. Bass, H., Milnor, J., Serre, J.-P.: Solution of the congruence subgroup problem forSL n n?3) andSp 2n (n?2). Publ. Math. Inst. Hautes Etud. Sci.44, 241?244 (1975)
2. Bump, D.: Automorphic forms onGL (3, ?). Lect. Notes Math.1083 (1984)
3. Bump, D., Friedberg, S., Goldfeld, D.: Kloosterman sums and Poincaré series forSL (3,?) (to appear)
4. Bump, D., Friedberg, S., Hoffstein, J.: Some cubic exponential sums (to appear)
5. Friedberg, S.: The Fourier expansion onGL(r) congruence subgroups. Appendix to ?Analytic Number Theory onGL (n)? by Dorian Goldfeld (to appear in the Procedings of the Stillwater Conference on Analytic Number Theory)