1. Godunov, S. K., Zabrodin, A. V., and Prokopov, G. P."A Difference Scheme for Two-Dimensiona1 Unsteady Problems of Gas Dynamics and Camputation of Flow With A Detached Shock Wave," -Zh. vych. mat.: No. 6, 1020-1058, 1961; also Cornell Aero-Lab Translation (AD614916).