1. Roe, P.L. (1981). Lecture Notes in Physics 141, 354–359.
2. Lombard, C.K. (1982). NASA CR166307.
3. Lombard, C.K.; Oliger, J. and Yang, J.Y. (1982). AIAA 82-0976.
4. Chakravarthy, S.R.; Anderson, D.A. and Salas, M.D. (1980). AIAA 80-0286.
5. Oliger, Joseph (1980). Numerical Methods for Partial Differential Equations, Seymour Parter, ed., Academic Press.