TR96-04, Department of Computational and Applied Mathematics, Rice
University, Houston, TX 77005. Also appears in * Proceedings of the
Copper Mountain Conference on Iterative Methods *, April 9-13, 1996.

TR96-06, Department of Computational and Applied Mathematics, Rice University, Houston, TX 77005. To appear in SIAM Journal on Matrix Analysis and Applications, 1998.

TR96665, Center for Research on Parallel Computation, Rice University, Houston, TX 77005. To appear in SIAM series in Software, Environments and Tools 1998.

Presented at the Sixth SIAM Conference on Applied Linear Algebra, Snowbird, Utah, Oct 1997.

Ph.D thesis, Department of Computational and Applied Mathematics, Rice University, Houston, TX 77005, May 1998