1. Ambrosio, L.: Lecture notes on optimal transport problems. Mathematical aspects of evolving interfaces (Funchal, 2000), Lecture Notes in Math. 1812, pp. 1–52. Springer, Berlin, (2003)
2. Bardi, M., Capuzzo-Dolcetta, I.: Optimal control and viscosity solutions of Hamilton-Jacobi-Bellman equations. Systems and Control: Foundations and Applications. Boston, Birkhäuser (1997)
3. Boutreux, T., de Gennes, P.-G.: Surface flows of granular mixtures. I. General principles and minimal model. J. Phys. I France 6, 1295–1304 (1996)
4. Cannarsa, P., Cardaliaguet, P.: Representation of equilibrium solutions to the table problem for growing sandpile. J. Eur. Math. Soc. 6, 1–30 (2004)
5. Cannarsa, P., Sinestrari, C.: Semiconcave Functions, Hamilton–Jacobi equations, and optimal control. Progress in Nonlinear Differential Equations and Theyr Applications. Boston, Birkhäuser (2004)