1. F.H. Clarke. Optimization and Nonsmooth Analysis. Wiley-Interscience, New York, 1983. Republished as vol.5 of Classics in Applied Mathematics, SIAM, 1990.
2. F.H. Clarke, Yu.S. Ledyaev, L.Rifford, and R.J. Stern. Feedback stabilization and Lyapunov functions. SIAM J. Control and Optim. To appear.
3. F.H. Clarke, Yu.S. Ledyaev, R.J. Stern, and P.R. Wolenski. Qualitative properties of trajectories of control systems: a survey. J. Dyn. Control Sys., 1:1–48, 1995.
4. F.H. Clarke, Yu.S. Ledyaev, R.J. Stern, and P.R. Wolenski. Nonsmooth Analysis and Control Theory. Graduate Texts in Mathematics, vol. 178. Springer-Verlag, New York, 1998.
5. F.H. Clarke and P.D. Loewen. State constraints in optimal control: a case study in proximal normal analysis. SIAM J. Control and Optim., 25:1440–1456, 1987.