Yaguang, Wang, Reflection of Transversal Progressing Waves for Semilinear Strictly Hyperbolic Systems, Acta Mathematica Sinica, New Series Chinese Journal of Mathematics, 9(1), 1993, pp. 8-23
We discuss the reflection of weak singularities of solutions to semilinear hyperbolic systems by using the method of energy estimates in the space of conormal distributions, and consequently obtain the general results on the reflection of weak singularities of the solution to a high order semilinear strictly hyperbolic equation.