1. Maximum principle and generalized principal eigenvalue for degenerate elliptic operators;Berestycki H, Capuzzo Dolcetta I, Porretta A, et al.;J Math Pure Appl
2. Directional ellipticity on special domains: Weak maximum and Phragmen-Lindelöf principles;Capuzzo Dolcetta I, Vitolo A;Nonlinear Anal
3. The weak maximum principle for degenerate elliptic operators in unbounded domains
4. On the weak maximum principle for fully nonlinear elliptic pde's in general unbounded domains
5. On the maximum principle for viscosity solutions of fully nonlinear elliptic equations in general domains