1. Linear Partial Differential Equations with Constant Coefficients;Treves,1966
2. Linear Partial Differential Operations;Hormander,1963
3. The Analysis of Linear Partial Differential Operators II;Hormander,1983
4. On the theory of general partial differential operators;Hormander;Acta Math.,1955
5. An Introduction to Complex Analysis in Several Variables;Hormander,1990