1. V. Barbu and G. DaPrato, to appear.
2. M. Bardi, Geometric properties of solutions of Hamilton-Jacobi equations, to appear.
3. M. Bardi, An asymptotic formula for the Green's function of an elliptic operator, to appear
4. M. Bardi and L. C. Evans, On Hopf's formulas for solutions of Hamilton-Jacobi equations, to appear in J. Nonlinear Analysis.
5. G. Barles, Existence results for first order Hamilton-Jacobi equations, Ann. L'Institut H. Poincaré 1(1984), 325–340.