1. Dirichlet, Neumann, and mixed boundary value problems for the wave equation uxx − uyy = 0 for a rectangle;Abdul-Latif;Jour. Appl. Anal.,1971
2. Un type nouveau des problèmes aux limites de la conduction de la chaleur;Adler;Magyar Tud. Akad. Mat. Kutato Int. Közl.,1959
3. A maximum principle for a class of hyperbolic equations and applications to equations of mixed elliptic - hyperbolic type;Agmon;Comm. Pure Appl. Math.,1953
4. Boundary value problems for equations of mixed type, Conv. Int. Eq. Lin. Der. Parz., Trieste;Agmon,1955
5. Lower bounds and uniqueness theorems for solutions of differential equations in a Hilbert space;Agmon;Comm. Pure Appl. Math.,1967