On Carleman Estimates for Pseudo-Differential Operators.
A Global Construction for Pseudo-Differential Operators with Non-Involutive Characteristcs.
Spectra of Compact Locally Symmetric Manifolds of Negative Curvature.
The Spectrum of Positive Elliptic Operators and Periodic Bicharacteristics.
Erratum: Spectra of Compact Locally Symmetric Manidfolds of Negative Curvature.
On the Variation in the Cohomology of the Symplectic Form of the Reduced Phase Space.
Addendum to "On the Variation in the Cohomology of the Symplectic Form of the Reduced Phase Space."
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