Systems of Hyperbolic PDE $D3) (Algorithm 392) CACM September, 1970 Smith, R. R. McCall, D. hyperbolic p.d.e., characteristic, extrapolation, second order p.d.e., quasilinear p. d. e. 5.17 CA700909 JB February 10, 1978 10:08 AM 1996 5 1996 1996 5 1996 1996 5 1996