1. Chapman, D. R., 1981, Lecture Notes in Physics, 141, pp. 1–11, Springer.
2. Trefethen, L. N., 1986, in Numerical Analysis, eds. Griffiths and Watson, pp. 200–219, Longman.
3. Iserles, A., 1986, IMA J. Num. Anal., 6, pp. 381–392.
4. Leonard, B. P., 1988, NASA Lewis, ICOMP Report, to appear.
5. Strang, G., Iserles, A., SIAM J. Num. Anal., 20, pp. 1251–1257.