1. Albers M., Camassa R., Holm D., Marsden J. (1994). The geometry of peaked solitons and billiard solutions of a class of integrable PDE’s. Lett. Math. Phys. 32:137–151
2. Balabane M. (1985). Non–existence of global solutions for some nonlinear wave equations with small Cauchy data. C. R. Acad. Sc. Paris 301:569–572
3. Berestycki H., Coron J.M., Ekeland I. (eds.) (1990). Variational Methods Progress in Nonlinear Differential Equations and Their Applications, Vol 4. Birkhäuser, Boston
4. Bressan, A., Constantin, A.: Global solutions to the Camassa-Holm equations. To appear
5. Bressan, A., Zhang, P., Zheng, Y.: On asymptotic variational wave equations. Arch. Rat. Mech. Anal. To appear