On subgroups of GL (n, A) which are generated by commutators. II.
On Subgroups of GL(n, A) which Are Generated by Commutators.
On suborbital graphs for the normalizer of .
On the Albanese variety of the moduli space of polarized K3 surfaces.
On the congruence subgroup problem, II.
On the Congruence Subgroups Problem: Determination of the "Metaplectic Kernel".
On the congruence-subgroup problem for some anisotropic algebraic groups over number fields.
On the Cuspidal Cohomology of the Bianchi Modular Groups.
On the Homology and Cohomology of Congruence Subgroups.
On the number of subgroups of given index in the modular group.
On the principal congruence subgroups of the Hecke-group .
On the Top Betti Number of Subgroups of SL(n,Z).
Operator k-theory for the group SU(n, 1).
p-adic deformations of cohomology classes of subgroups of GL (N,Z).
Power subgroups of Hecke groups .
Quotients of Infinite Reflection Groups.
Radical relations in unitary, symplectic, and orthogonal groups.
Ramanujan-Identitäten zur Reziproken der Jacobischen Funktion .. .
Real Strict Localizations.
Reduction theory using semistability.