Elliptic partial differential equations in two variables with analytic coefficients.- Boundary value problems associated with e[u]=0.- Higher order, linear elliptic equations of two independent variables.- Further representations for solutions of higher order elliptic differential equations with analytic coefficients.- Elliptic equations in dimension n?3.- Singularity properties of solutions to partial differential equations.- Higher order and higher dimensional elliptic problems.- Initial value problems for semilinear elliptic equations.- Elliptic systems of first order differential equations: General theory.- Elliptic systems of first order differential equations: Further results and constructive methods.