1. Linear Partial Differential Operators;Hörmander,1976
2. A nonhyperbolic Cauchy problem for □b □c, and its applications to elasticity theory;Isakov;Comm. Pure Appl. Math.,1986
3. Uniqueness of the continuation across a time-like hyperplane and related inverse problems for hyperbolic equations;Isakov;Comm. Partial Differential Equations,1989
4. Continuous dependence on data for solutions of partial differential equations with a prescribed bound;John;Comm. Pure Appl. Math.,1960
5. On an Ill Posed Cauchy Problem for the Wave Equation;Levine;ONR Report,1985