1. Lectures on Elliptic Boundary Value Problems;Agmon,1965
2. Bergman spaces and their operators;Axler,1988
3. Harmonic Function Theory;Axler,1992
4. Projections in spaces of holomorphic functions in balls;Forelli;Indiana Univ. Math. J.,1974
5. Elliptic Partial Differential Equations of Second Order;Gilbarg,1983