On the Group of Norm 1 Elements in a Division Algebra.
Torsion in Cocompact Lattices in Coverings of Spin (2,n).
Principal bundles on affine space and bundles on the projective line.
Torsion in cocompact lattices in coverings of spin (2, n) (Corrigendum).
Principal bundles admitting a rational section.
A Note on Quotients of Real Algebraic Groups by Arithmetic Subgroups.
On the congruence subgroup problem, II.
Principle bundles admitting a rational section (Erratum).
On the Kneser-Tits problem.
On the Congruence Subgroups Problem: Determination of the "Metaplectic Kernel".
Topological central extensions of SL1 (D).
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