Eigenfunction Branches of Nonlinear Operators, and their Bifurcations
Seminar on Functional Operators and Equations: Forschungsinstitut Für Mathematik, Eth, Zürich, October 1965 - July 1966 (Lecture Notes in Mathematics, 33)
Propagation of Singularities for Fuchsian Operators (Lecture Notes in Mathematics, 984)
Linear Operators and Operator Equations
Oscillation Theory (Lecture Notes in Mathematics, 324)
Partial differential equations Basic theory
Constructive Methods for Elliptic Equations (Lecture Notes in Mathematics, 365)
Propagation Des Singularites Des Solutions d'Equations Pseudo-Differentielles a Caracteristiques de Multiplicites Variables (Lecture Notes in Mathematics, 856) (French Edition)
Regular Boundary Value Problems Associated with Pairs of Ordinary Differential Expressions (Lecture Notes in Mathematics, 858)
Coincidence Degree and Nonlinear Differential Equations (Lecture Notes in Mathematics, No.568) (Lecture Notes in Mathematics, 568)