A comparison of CGS preconditioning methods for Newton's method solvers. - Paul D. Orkwis; John H. George (Neural Parallel Sci. Comput., 1994)

Numerical Solutions of the Euler Equations for Steady Flow Problems (Albrecht Eberle, Arthur Rizzi, and Ernst Heinrich Hirschel). - Paul D. Orkwis (SIAM Rev., 1995)