Perturbation of equivariant moduli spaces.
On the Homology and Cohomology of Congruence Subgroups.
Locally flat 2-spheres in simply connected 4-manifolds.
Correction to "Locally flat 2-spheres in simply connected 4-manifolds".
Cohomology of arithmetic subgroups of SL3 at infinity.
Invariants of branched covering from the work of Serre and Mumford.
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