1. Alvarez, O., Barron, E.N., Ishii H.: Hopf-Lax formulas for semicontinuous data. Indiana Univ. Math. J. 48(3), 993–1035 (1999)
2. Lecture notes in Control and Inform. Sci.;M. Atteia,1981
3. Attouch, H.: Variational Convergence for Functions and Operators. Pitman, Boston 1984
4. Aubin, J.-P, Frankowska, H.: Set-Valued Analysis. Birkhäuser, Basel 1990
5. Pitman Research Notes in Mathematics;D. Azé,1992