1. Bressan, A., Hyperbolic Systems of Conservation Laws, The One Dimensional Cauchy Problem, Oxford University Press, 2000.
2. Dai, W. R., Geometry of quasilinear hyperbolic systems with constant multiple characteristic fields, preprint.
3. Du, Y. L., Global classical solutions of one-dimensional quasilinear hyperbolic systems (in Chinese), Journal of Shanghai Jiao Tong University, 39(6), 2005, 1025-1027.
4. John, F., Formation of singularities in one-dimensional nonlinear wave propagation, Comm. Pure Appl. Math., 27, 1974, 377-405.
5. Kong, D. X., Cauchy Problem for Quasilinear Hyperbolic Systems, MSJ Memoirs, 6, the Mathematical Society of Japan, Tokyo, 2000.