- Duff, I., Erisman, A., and Reid, J., 1986, Direct Methods for Sparse Matrices: Oxford University Press.

- Fornberg, B., 1989, Accurate representations of interfaces in elastic wave calculations: Geophysics,
**53**, 625-638.

- Golub, G., and Van Loan, C., 1989, Matrix Computations (
*second edition*): John Hopkins University Press.

- Johnson, C., 1989, Numerical solution of partial differential equations by the finite element method: Cambridge University Press.

- Lee, H-C., and Wathen, A.J., 1989, On element-by-element preconditioning for general elliptic problems: Numerical Analysis Report
**NA-89-10**, Computer Science Dept., Stanford University.

- Mathur, K., 1990, On the use of randomized address maps in unstructured three dimensional finite element simulations: Thinking Machines Corporation, technical report series,
**CS90-4**.

12/18/1997