1. Lectures on Elliptic Boundary Value Problems;Agmon,1965
2. Extrinsic upper bounds for eigenvalues of Dirac-type operators;Anghel;Proc. Amer. Math. Soc.,1993
3. An abstract index theorem on noncompact Riemannian manifolds;Anghel;Houston J. Math.,1993
4. Elliptic operators, discrete groups and von Neumann algebras;Atiyah,1976
5. Heat kernels and Dirac operators;Berline,1992