1. Li, T.-T., Controllability and Observability for Quasilinear Hyperbolic Systems, AIMS Series on Applied Mathematics, 3, AIMS, Springfield, MO; Higher Education Press, Beijing, 2010.
2. Li, T.-T. and Peng, Y.-J., Problme de Riemann gnralis pour une sorte de systmes des cables, Portugaliae Mathematica, 50, 1993, 407–437.
3. Li, T.-T. and Rao, B. P., Local exact boundary controllability for a class of quasilinear hyperbolic systems, Chin. Ann. Math. Ser. B, 23, 2002, 209–218.
4. Li, T.-T. and Rao, B. P., Exact boundary controllability for quasilinear hyperbolic systems, SIAM J. Control. Optim., 41, 2003, 1748–1755.
5. Li, T.-T., Serre, D. and Zhang, H., The generalized Riemann problem for the motion of elastic strings, SIAM J. Math. Anal., 23, 1992, 1189–1203.