Viscosity solutions and applications : lectures given at the 2nd session of the Centro Internazionale Matematico Estivo (C.I.M.E.) held in Montecatini Terme, Italy, June 12-20, 1995 - Bardi, M.; Capuzzo Dolcetta, I.; Lions, P. L. (Lecture Notes in Mathematics / Springer-Verlag ;, 1997)